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Area Code 720

Colorado · Mountain time · now 1:41 PM

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Area code 720 is a real Colorado area code

Calls from 720 normally come from Colorado — 21 cities across 9 counties, in the Mountain time zone. Our archive holds 2,968 caller reports on 757 numbers in this area code.

  • A valid area code is not a guarantee — any number can be spoofed to look local.
  • If the caller claims to be your bank or a government agency, hang up and dial the number printed on your card or their official site.

Check the exact number that called you

An area code only tells you the region. Search the full number to see listings and reports for it.

COstate
21cities served
37carriers
1:41 PMlocal time

Where is area code 720?

Area code 720 serves Colorado, covering Denver, Aurora, Longmont, Aurora, Denver. In total our directory records 800 phone prefixes in this area code, spread across 21 cities and 9 counties.

The area code sits in the Mountain time zone (UTC-07:00), where the local time is now approximately 1:41 PM. The oldest prefix on record here entered service on 1999-02-27, and the newest on 2015-09-28.

Of the prefixes with a known line type, 39% are wireless and 61% landline — 218 mobile against 346 fixed-line prefixes.

Area code 720 on the map

Colorado is highlighted below. Schematic map — each square is one state or territory.

AKMEVTNHWAIDMTNDMNILWIMINYRIMAORNVWYSDIAINOHPANJCTCAUTCONEMOKYWVVAMDDEAZNMKSARTNNCSCDCOKLAMSALGAHITXFLPRVI

Line types in this area code

Landline prefixes346 · 61%
Wireless prefixes218 · 39%
Time zoneMountain
UTC offset-07:00
In service since1999
Counties covered9

Carriers operating in area code 720

Telephone companies holding prefixes in this area code, ranked by how many they operate.

CarrierLine typePrefixes
Qwest CorporationLandline100
New Cingular Wireless Pcs, LlcWireless75
Sprint Spectrum L.p.Wireless62
Xo Colorado, LlcLandline42
Cellco Partnership Dba Verizon WirelessWireless36
T-Mobile Usa, Inc.Wireless35
Bandwidth.com Clec, LlcLandline29
Level 3 Communications, LlcLandline23
Teleport Communications America, LlcLandline20
Eschelon Telecom Of Colorado, Inc.Landline17
Icg Telecom GroupLandline15
Tw Telecom Of Colorado LlcLandline15
At&t LocalLandline12
Mcleodusa Telecommunications Services, Inc.- CoLandline10
Comcast Phone Of Colorado, LlcLandline10

Cities in area code 720

Places served by this area code, with the number of prefixes assigned to each.

Denver423 prefixes · DenverAurora43 prefixes · ArapahoeLongmont16 prefixes · BoulderAurora12 prefixes · AdamsDenver11 prefixes · JeffersonDenver10 prefixes · AdamsLone Tree8 prefixes · DouglasBrighton6 prefixes · WeldFort Lupton6 prefixes · WeldKeenesburg4 prefixes · WeldBrighton4 prefixes · AdamsHudson3 prefixes · WeldJamestown3 prefixes · BoulderSedalia3 prefixes · DouglasHenderson3 prefixes · AdamsEnglewood2 prefixes · ArapahoeLittleton2 prefixes · JeffersonIdaho Springs2 prefixes · Clear CreekLittleton2 prefixes · ArapahoeArvada2 prefixes · JeffersonGolden1 prefixes · JeffersonDeer Trail1 prefixes · ArapahoeBlack Hawk1 prefixes · GilpinEvergreen1 prefixes · JeffersonArapahoe1 prefixes · ArapahoeAdams1 prefixes · Adams

Caller reports for area code 720

Aggregated from 2,968 reports covering 757 distinct numbers in this area code (2015–2017 archive).

Reported call types

Unknown1,013Telemarketer934Debt Collector194Prank Call60Prank Caller49Political Call48Survey32Non-profit Organization26

Most reported numbers

720-377-929339 reports720-214-044239 reports720-684-408038 reports720-204-128638 reports720-263-451236 reports720-282-505436 reports720-214-238434 reports720-564-015633 reports

Who callers said they were

Names people entered when reporting a call from this area code.

? ×29Unknown ×24Comenity ×23Auto Warranty ×21Westwood College ×18Dearborn Data ×14Everest University ×14Denver Post ×12Everest College ×11Comcast ×11Denver co ×11Don't know ×10

Report activity by year

20151,388 · 88%
20161,580 · 100%

Numbers reported in area code 720

Each number below was reported by someone who received a call from it. “Reported as” is the name the caller gave or that the recipient recognised — what people wrote down, not verified ownership.

NumberReportsCall typeReported asLast report
720-377-929339Telemarketer, UnknownMGA Accelerated Services, AKA JPM Accelerated2016-04-23
720-214-044239Prank Caller, Survey, Telemarketer, UnknownDearborn Data / Dearborn Data/Bolder Calls2016-04-14
720-684-408038Prank Caller, Telemarketer, UnknownEverest University / TELEMARKETER2016-04-19
720-204-128638Prank Caller, Telemarketer, Unknownhelen wilson blas / QCS Programs / United States Benefits2016-05-02
720-263-451236Debt Collector, Telemarketer, UnknownReaders Source / Ruben2016-04-18
720-282-505436Debt Collector, Political Call, UnknownLighthouse Recovery2016-04-28
720-214-238434Prank Caller, Telemarketer, UnknownAuto Warranty / Didnt answer / DISH Networks / Sat TV promo2016-04-28
720-564-015633Telemarketer, Unknown720.564-0156 / Auto Warranty / C1F Marketing / Car Warranty2016-05-02
720-407-046533Debt Collector, Telemarketer, UnknownCar Warranty Referral Service/Spammers2016-04-29
720-685-633033Prank Caller, Telemarketer, UnknownGE Home Security Scam / secure usa2016-04-26
720-684-431830Debt Collector, Prank Caller, Telemarketer, Unknown—2016-04-23
720-684-407928Prank Caller, Telemarketer, UnknownCollege / Everest College2016-04-30
720-685-630825Telemarketer, UnknownBrittany and Erica / Brittany- recording2016-04-30
720-456-368024Debt Collector, UnknownComenity / Comenity Capital / Commenity Bank / victorias secret/comenity bank2016-05-02
720-212-080523Prank Caller, Telemarketer, Unknown—2016-04-30
720-506-436423Telemarketer, UnknownWestwood College2016-04-18
720-225-997022Debt Collector, Telemarketer, UnknownFinancial Media Group2016-05-02
720-398-270022Prank Caller, Telemarketer, Unknown? / George from IConnect Group / It didn't say / No message left2016-04-22
720-330-728419Telemarketer, UnknownDenver Post2016-03-20
720-684-431618Telemarketer, UnknownWyotech2016-04-21
720-382-283518Telemarketer, UnknownSouth University Online2016-04-29
720-214-044018Telemarketer, UnknownAllstate Insurance / Dearborn Data2016-05-01
720-200-032617Debt Collector, UnknownPBC / Professional Bureau of Collect2016-04-30
720-799-910416Telemarketer, Unknown"Activation" / ? / Activation / auto insurance (won't give me their name)2016-04-03
720-974-045216Telemarketer, UnknownWestwood College2016-04-16
720-239-152915Political Call, UnknownColorado Prop 1032016-03-21
720-452-646714Prank Call, Telemarketer"Private" / 720-452-6467 KP / B Services / Fake Google2016-05-01
720-924-225314Telemarketer, UnknownAmazon.com2016-04-30
720-596-702614Political Call, Unknown—2016-04-26
720-257-523914Telemarketer'Rockefeller's Office' / Caller ID: unknown / Lance Menuey's Office / None displayed2016-03-28
720-262-823914Debt Collectorjust my cell phone / Stellar / Stellar Communications / Stellar Recovery2016-04-24
720-221-685314Telemarketer20/20 / Berkshire tax / Denver / NO COMPANY2016-04-22
720-961-574614Prank Call, Telemarketer, UnknownCaller ID said "Denver" / Denver / Didn't Say / Galvin Austin2016-03-21
720-974-930814Telemarketer, UnknownASU2016-03-04
720-639-808014Telemarketercolorado / Elite Vacations / Florida Vacations / Florida Vacations - very vague2016-05-02
720-932-282113Telemarketer, UnknownTMG Marketing2016-05-01
720-325-264713Debt Collector, Telemarketer"Card Holder Services" / AMC / Card Holder Services / CO, USA2016-04-27
720-974-924713Telemarketer20 20 Tax Service. / 20/20 / unidentified2016-04-19
720-440-580113Prank Call, Telemarketerbusiness listing / Denver CO / Denver Co and 17204405801 / Denver CO.2016-04-11
720-799-911413Telemarketer, UnknownAlarm company / Criminals / Denver CO / Home Protection2016-04-06
720-450-927812Telemarketer? / ???? / Comcast / cricket wireless?2016-03-05
720-315-793212Telemarketer, Unknown—2016-03-17
720-799-916012Non-profit Organization, Telemarketer? / Denver Co / Denver, CO. / LOCAL SHERO2016-04-01
720-644-445512Telemarketer? / Denver post / Sullivan Promos (for Denver Post sales) / Sullivan Promotiona2016-04-19
720-568-055112Telemarketer, UnknownADT / ADT solicitor / Alert Security2016-04-13
720-799-299712Non-profit Organization, Telemarketer"1CHARITY" / 1 Charity / 1Charity / 1Charity (if you believe the CID)2016-04-12
720-551-166812Debt Collector, Prank Call, Telemarketer"IRS Audit co" / "IRS" / California IRS / Claimed IRS2016-04-23
720-639-798412Non-profit Organization, Prank Call, TelemarketerAmerican 1st Home Security / American Car Center / American First / COREHOME2016-04-05
720-277-004412Telemarketer, Unknown"Veteran's Affairs" / Aurora Co / Aurora, CO / I don't know2016-04-30
720-457-276112Telemarketer(720) 457-2761 CO, USA / Enrolled Agents / Federal Government (Whatever) / Grupo Fimis2016-04-26
720-833-797311Telemarketer, UnknownDenver, CO. / Innovative services / Unkown2016-04-02
720-456-368811Debt Collector, Event ReminderComeity bank / Comenity / Comenity Bank / COMMENITY2016-04-19
720-456-368911Debt Collector, UnknownComenity / Comenity Bank / Mauri es2016-04-26
720-639-796811TelemarketerAlarm Co / alarm co. / alarm company / Don't know2016-04-29
720-315-792211Prank Caller, Telemarketer, Unknownmarketing2016-04-11
720-639-796311Prank Call, TelemarketerAuto Guard / Auto warantee / Car Warranty Telemarketer Machine / Car warrenty2016-03-19
720-325-297211Political Call, Telemarketer?? / ??? / Career Genie / K mart career genie2016-03-05
720-549-641511Unknown—2016-04-07
720-864-070311Prank Call, Telemarketer"Assist" / ? / Assist? / do not know name2016-03-21
720-864-285611Telemarketer, Unknown—2016-02-21

Showing the 60 most-reported of 757 numbers on record for this area code.

Businesses with 720 numbers

Our business records list 30,260 companies reachable on a 720 number, across 421 cities and 2,851 lines of business. If an unexpected call came from this area code, it may well be one of them.

What they do

Business Consulting, Nec 1,071Services, Nec 880Business Services, Nec 839Single-family Housing Construction 792Design Services 686Cleaning Services 421-- 404Real Estate Brokers And Agents 361Health And Allied Services, Nec 359Investors, Nec 344Beauty Shops 338Painting And Paper Hanging 318Nonresidential Building Operators 309Photographer, Still Or Video 287Insurance Agents, Brokers, And Service 252

Larger organisations on 720 numbers

Headcount and founding year are as recorded in the business register, and a business may hold a number outside the state it operates in.

BusinessPhoneCityIndustryStaffFounded
Noodles & Company720-214-1900BroomfieldEating Places2,9161995
Level 3 Communications, LLC720-888-1000BroomfieldTelephone Communication, Except Radio2,1001998
Boulder Community Foothills Hospital720-854-7000BoulderGeneral Medical And Surgical Hospitals2,0001922
Children's Hospital Colorado720-777-1234AuroraChildrens' Hospital1,9001908
Hca-Healthone LLC720-225-1000Lone TreeHospital, Affiliated With Ama Residency1,200—
Sky Ridge Medical Center720-225-1000Lone TreeHealth Services1,000—
Pinnacle Entertainment, Inc.720-946-4000Black HawkCasino Hotel900—
County of Adams720-523-6100BrightonGovernment - County Planning And Development Agency, Government8521902
Raytheon Company720-482-9173Greenwood VillageManufacturing - Radar Systems And Equipment700—
AATA INTERNATIONAL, INC.720-974-2550DenverEnvironmental Research6251995
Northrop Grumman Space & Mission Systems Corp.720-744-7000AuroraComputer Software Writers, Freelance600—
International Networks LLC720-873-2900EnglewoodCable And Other Pay Television Services6002004
Starz Entertainment, LLC720-852-7700EnglewoodMotion Picture Production And Distribution, Television5871998
Tyson Foods, Inc.720-733-6678Castle RockPoultry And Poultry Products566—
Health Carechain, Inc.720-932-6262BoulderMedical Field-related Associations5502000
Nordstrom, Inc.720-887-0333BroomfieldFamily Clothing Stores500—
Raynor Door Authority of Denver720-443-0289DenverRetail - Door And Window Products500—
Kiewit Western Co.720-981-7541EnglewoodGeneral Contractor, Highway And Street Construction450—
South Metro Fire Rescue Fire Protection District720-989-2000CentennialGovernment - Fire Department, Not Including Volunteer4052009
Denver Art Museum720-865-5000DenverMuseum4011941
Adams 12 Five Star Schools720-972-4000ThorntonPublic Elementary School4001950
Physicians Network Association, Inc.720-622-8079Greenwood VillageMedical Services Organization3902012
Arvada, City of (inc)720-898-7000ArvadaGovernment - Mayors' Office3631904
Home Buyers Warranty Corporation720-747-6000DenverWarranty Insurance, Home3532002
Pricewaterhousecoopers LLP720-931-7000DenverCertified Public Accountant350—
Whole Foods Market Rocky Mountain/Southwest, L.P.720-941-4100DenverRetail - Supermarkets, Chain350—
Global Healthcare Exchange, Inc.720-887-7000LouisvilleBlood Related Health Services3501999
Transamerica Capital, Inc.720-482-1500DenverMoney Market Mutual Funds3201999
Cbre, Inc.720-528-6300Greenwood VillageReal Estate Agent, Commercial3002009
Colorado Department of Military and Veterans Affairs720-480-8703CentennialNational Security300—
Arcadis U.S., Inc.720-344-3500Highlands RanchEnvironmental Consultant3001993
Resources Trust Company720-244-8711Greenwood VillageInvestment Offices, Nec3002001
Arvada, City of (inc)720-898-6900ArvadaGovernment - Police Protection, Local Government300—
BROADBAND SERVICES, INC720-344-5090LittletonWholesale - Radio And Television Equipment And Parts3001999
Wal-Mart Stores, Inc.720-748-1000DenverRetail - Department Stores, Discount300—
City & County of Denver720-913-1999DenverGovernment - Housing Programs, Planning And Development: Government300—
Underwriters Laboratories Inc.720-890-8585BroomfieldInsurance Agents, Brokers, And Service300—
City & County of Denver720-865-1111DenverPersonal Service Agents, Brokers, And Bureaus300—
St. Julien Partners LLC720-406-9696BoulderSpas3001999
Longmont Clinic, P.C.720-494-3130LongmontClinic, Operated By Physicians2981906

Where they are

Denver 7,716Aurora 3,706Littleton 2,016Parker 1,368Boulder 1,273Lakewood 1,235Centennial 1,206Englewood 1,037Highlands Ranch 1,001Longmont 912Arvada 846Broomfield 808Westminster 748Castle Rock 745Thornton 689Greenwood Village 610Brighton 424Golden 354Lafayette 300Northglenn 290

Directory listings in area code 720

1 listing from the YPState archive use this area code.

Sun JerryBoulder, Colorado720-564-4914

ZIP codes in area code 720

Postal codes recorded against prefixes in this area code.

800028001080011800128001480015800168001780045801058011180112801138012280123801248012680127801298013080135802028020380204802058020680207802098021080211802128021480215802168021880219802208022180222802238022480226802278022880229802308023180232802338023480235802368023780238802398024180249802648026580290802938029480299804018040380422804398045280455805018050380504805108054080601806028060380621806408064280643

Phone prefixes in area code 720

Each prefix (the first three digits after the area code) is assigned to a carrier and a service area. Showing the first 200 of 800.

PrefixCityCountyCarrierTypeIn service
720-200DenverDenverQwest CorporationLandline1999-02-27
720-201DenverDenverNew Cingular Wireless Pcs, LlcWireless2001-06-30
720-202DenverDenverCellco Partnership Dba Verizon WirelessWireless2009-10-07
720-203DenverDenverSprint Spectrum L.p.Wireless2001-01-29
720-204LongmontBoulderAt&t LocalLandline1999-02-27
720-205DenverDenverSprint Spectrum L.p.Wireless2001-06-30
720-206DenverDenverXo Colorado, LlcLandline1999-05-10
720-207Lone TreeDouglasXo Colorado, LlcLandline1999-05-10
720-208DenverDenverXo Colorado, LlcLandline1999-05-10
720-209AuroraArapahoeSprint Spectrum L.p.Wireless2000-01-14
720-210DenverDenverXo Colorado, LlcLandline1999-05-10
720-211—————
720-212DenverDenverXo Colorado, LlcLandline1999-05-10
720-213DenverDenverMcleodusa Telecommunications Services, Inc.- CoLandline2001-06-30
720-214DenverDenverMcleodusa Telecommunications Services, Inc.- CoLandline2001-03-03
720-215DenverDenverCellco Partnership Dba Verizon WirelessLandline2009-10-12
720-216DenverDenverTeleport Communications America, LlcLandline2001-01-29
720-217DenverDenverT-Mobile Usa, Inc.Wireless1999-02-27
720-218DenverDenverSprint Spectrum L.p.Wireless2000-01-14
720-219DenverDenverCellco Partnership Dba Verizon WirelessWireless2000-01-14
720-220DenverDenverT-Mobile Usa, Inc.Wireless1999-05-10
720-221DenverDenverXo Colorado, LlcLandline1999-05-10
720-222Lone TreeDouglasXo Colorado, LlcLandline1999-05-10
720-223BrightonAdamsXo Colorado, LlcLandline1999-05-10
720-224DenverDenverXo Colorado, LlcLandline1999-05-10
720-225DenverDenverXo Colorado, LlcLandline1999-05-10
720-226DenverDenverXo Colorado, LlcLandline1999-05-10
720-227DenverDenverXo Colorado, LlcLandline1999-05-10
720-228DenverDenverXo Colorado, LlcLandline1999-05-10
720-229DenverDenverXo Colorado, LlcLandline1999-05-10
720-230BrightonAdamsXo Colorado, LlcLandline1999-05-10
720-231DenverDenverT-Mobile Usa, Inc.Wireless1999-05-10
720-232AuroraArapahoeSprint Spectrum L.p.Wireless1999-05-10
720-233AuroraArapahoeSprint Spectrum L.p.Wireless1999-05-10
720-234AuroraArapahoeSprint Spectrum L.p.Wireless1999-05-10
720-235AuroraArapahoeSprint Spectrum L.p.Wireless1999-05-10
720-236AuroraArapahoeSprint Spectrum L.p.Wireless1999-05-10
720-237DenverDenverNew Cingular Wireless Pcs, LlcWireless2009-09-28
720-238DenverDenverT-Mobile Usa, Inc.Wireless2001-06-30
720-239DenverDenverAt&t LocalLandline2001-03-03
720-240DenverDenverXo Colorado, LlcLandline1999-05-10
720-241DenverDenverXo Colorado, LlcLandline1999-05-10
720-242DenverDenverQwest CorporationLandline2008-10-09
720-243DenverDenverNew Cingular Wireless Pcs, LlcWireless2009-06-30
720-244DenverDenverNew Cingular Wireless Pcs, LlcWireless2001-06-30
720-245DenverDenverEschelon Telecom Of Colorado, Inc.Landline2011-11-21
720-246Lone TreeDouglasXo Colorado, LlcLandline1999-05-10
720-247BrightonWeldXo Colorado, LlcLandline2004-05-20
720-248AuroraArapahoeCbeyond Communications, LlcLandline2000-10-31
720-249DenverDenverXo Colorado, LlcLandline1999-05-10
720-250DenverDenverXo Colorado, LlcLandline1999-05-10
720-251DenverDenverLevel 3 Communications, LlcLandline2002-10-25
720-252AuroraArapahoeSprint Spectrum L.p.Wireless1999-05-10
720-253AuroraArapahoeSprint Spectrum L.p.Wireless1999-05-10
720-254AuroraArapahoeSprint Spectrum L.p.Wireless1999-05-10
720-255AuroraArapahoeSprint Spectrum L.p.Wireless1999-05-10
720-256AuroraArapahoeSprint Spectrum L.p.Wireless1999-05-10
720-257DenverDenverXo Colorado, LlcLandline1999-05-10
720-258DenverDenverTeleport Communications America, LlcLandline2000-10-31
720-259DenverDenverLevel 3 Communications, LlcLandline2002-10-25
720-260DenverDenverSprint Spectrum L.p.Wireless2000-06-13
720-261DenverDenverT-Mobile Usa, Inc.Wireless1999-05-10
720-262AuroraArapahoeIcg Telecom GroupLandline2000-08-20
720-263BrightonAdamsLevel 3 Communications, LlcLandline2002-10-25
720-264DenverDenverQwest CorporationLandline2001-03-03
720-265BrightonWeldXo Colorado, LlcLandline2004-05-03
720-266DenverDenverLevel 3 Communications, LlcLandline2002-10-25
720-267DenverDenverQwest CorporationLandline2001-06-30
720-268DenverDenverQwest CorporationLandline2001-06-30
720-269DenverDenverTeleport Communications America, LlcLandline1999-05-10
720-270DenverDenverSprint Spectrum L.p.Wireless2000-08-20
720-271DenverDenverSprint Spectrum L.p.Wireless2000-06-13
720-272DenverDenverNew Cingular Wireless Pcs, LlcWireless2001-01-18
720-273DenverDenverNew Cingular Wireless Pcs, LlcWireless2001-01-18
720-274DenverDenverMcleodusa Telecommunications Services, Inc.- CoLandline2001-03-03
720-275DenverDenverNew Cingular Wireless Pcs, LlcWireless2001-02-22
720-276DenverDenverNew Cingular Wireless Pcs, LlcWireless2001-02-22
720-277ArvadaJeffersonLevel 3 Communications, LlcLandline2001-03-03
720-278AuroraArapahoeTw Telecom Of Colorado LlcLandline2001-01-25
720-279AuroraArapahoeTw Telecom Of Colorado LlcLandline2001-01-25
720-280DenverDenverT-Mobile Usa, Inc.Wireless2000-10-31
720-281DenverDenverCellco Partnership Dba Verizon WirelessWireless2000-06-13
720-282AuroraArapahoeTw Telecom Of Colorado LlcLandline2001-01-25
720-283DenverDenverQwest CorporationLandline1999-02-27
720-284DenverDenverXo Colorado, LlcLandline1999-02-27
720-285Lone TreeDouglasXo Colorado, LlcLandline2009-01-30
720-286DenverDenverTeleport Communications America, LlcLandline2002-04-30
720-287DenverDenverComcast Phone Of Colorado, LlcLandline2010-04-30
720-288DenverDenverBandwidth.com Clec, LlcLandline2010-02-26
720-289DenverDenverNew Cingular Wireless Pcs, LlcWireless2001-07-25
720-290DenverDenverSprint Spectrum L.p.Wireless2000-08-20
720-291DenverDenverSprint Spectrum L.p.Wireless2000-08-20
720-292DenverDenverNew Cingular Wireless Pcs, LlcWireless2009-03-04
720-293DenverDenverXo Colorado, LlcLandline2000-06-13
720-294DenverDenverXo Colorado, LlcLandline2000-06-13
720-295DenverDenverBandwidth.com Clec, LlcLandline2010-03-01
720-296DenverDenverNew Cingular Wireless Pcs, LlcWireless2001-01-12
720-297DenverDenverNew Cingular Wireless Pcs, LlcWireless2001-01-12
720-298DenverDenverNew Cingular Wireless Pcs, LlcWireless2001-01-12
720-299DenverDenverT-Mobile Usa, Inc.Wireless2001-03-03
720-300DenverDenverSprint Spectrum L.p.Wireless2000-08-20
720-301DenverDenverSprint Spectrum L.p.Wireless2000-08-20
720-302DenverDenverTeleport Communications America, LlcLandline1999-02-27
720-303—————
720-304DenverDenverQwest CorporationLandline1999-02-27
720-305DenverDenverTw Telecom Of Colorado LlcLandline2001-01-29
720-306DenverDenverEschelon Telecom Of Colorado, Inc.Landline2001-01-29
720-307JamestownBoulderAt&t LocalLandline2012-08-02
720-308DenverDenverNew Cingular Wireless Pcs, LlcLandline2001-08-14
720-309DenverDenverNew Cingular Wireless Pcs, LlcWireless2001-12-05
720-310LongmontBoulderTeleport Communications America, LlcLandline1999-05-10
720-311—————
720-312DenverDenverSprint Spectrum L.p.Wireless2001-02-20
720-313DenverDenverSprint Spectrum L.p.Wireless2001-02-20
720-314DenverDenverSprint Spectrum L.p.Wireless2001-02-20
720-315DenverDenverOnvoy, LlcLandline2009-10-14
720-316DenverDenverBandwidth.com Clec, LlcLandline2010-05-24
720-317AuroraArapahoeSprint Spectrum L.p.Wireless2000-01-14
720-318AuroraArapahoeSprint Spectrum L.p.Wireless1999-02-27
720-319DenverDenverSprint Spectrum L.p.Wireless2001-04-19
720-320DenverDenverNew Cingular Wireless Pcs, LlcWireless2000-06-13
720-321DenverDenverQwest CorporationLandline2008-05-29
720-322DenverDenverQwest CorporationLandline2000-10-31
720-323DenverDenverT-Mobile Usa, Inc.Wireless2001-03-03
720-324AuroraArapahoeComcast Phone Of Colorado, LlcLandline2000-10-31
720-325DenverDenverT-Mobile Usa, Inc.Wireless2010-08-06
720-326DenverDenverNew Cingular Wireless Pcs, LlcWireless2011-06-13
720-327DenverDenverNew Cingular Wireless Pcs, LlcWireless2001-10-18
720-328DenverDenverComcast Phone Of Colorado, LlcLandline2009-10-20
720-329DenverDenverNew Cingular Wireless Pcs, LlcWireless2001-10-18
720-330DenverDenverIcg Telecom GroupLandline1999-02-27
720-331DenverDenverSprint Spectrum L.p.Wireless2000-08-20
720-332DenverDenverMcimetro Access Transmission Services LlcLandline1999-02-27
720-333DenverDenverSprint Spectrum L.p.Wireless2001-05-14
720-334DenverDenverSprint Spectrum L.p.Wireless2001-05-14
720-335DenverDenverSprint Spectrum L.p.Wireless2001-05-14
720-336KeenesburgWeldBandwidth.com Clec, LlcLandline2010-07-19
720-337DenverDenverQwest CorporationLandline2009-02-18
720-338DenverDenverNew Cingular Wireless Pcs, LlcWireless2001-11-19
720-339AuroraArapahoeSprint Spectrum L.p.Wireless1999-02-27
720-340LongmontBoulderCellco Partnership Dba Verizon WirelessWireless2009-09-04
720-341DenverDenverT-Mobile Usa, Inc.Wireless2000-10-31
720-342DenverDenverAt&t LocalLandline2009-04-15
720-343AuroraArapahoeLevel 3 Communications, LlcLandline2003-10-31
720-344LittletonArapahoeQwest CorporationLandline1999-10-13
720-345DenverDenverZippytech IncorporatedLandline2007-12-28
720-346DenverDenverCellco Partnership Dba Verizon WirelessLandline1999-02-27
720-347DenverDenverTw Telecom Of Colorado LlcLandline2009-09-28
720-348LittletonArapahoeQwest CorporationLandline2000-10-31
720-349DenverDenverAt&t LocalLandline2011-03-28
720-350DenverDenverSprint Spectrum L.p.Wireless1999-02-27
720-351DenverDenverSprint Spectrum L.p.Wireless1999-02-27
720-352DenverDenverT-Mobile Usa, Inc.Wireless1999-02-27
720-353DenverDenverSprint Spectrum L.p.Wireless1999-02-27
720-354DenverDenverTw Telecom Of Colorado LlcLandline2011-06-30
720-355DenverDenverCellco Partnership Dba Verizon WirelessWireless2012-08-16
720-356DenverDenverAt&t LocalLandline1999-02-27
720-357DenverDenverNew Cingular Wireless Pcs, LlcWireless2012-07-05
720-358HudsonWeldMcimetro Access Transmission Services LlcLandline2009-09-09
720-359DenverDenverQwest CorporationLandline1999-02-27
720-360DenverDenverNew Cingular Wireless Pcs, LlcWireless2013-01-28
720-361DenverDenverEschelon Telecom Of Colorado, Inc.Landline2013-07-03
720-362DenverDenverQwest CorporationLandline2007-06-06
720-363DenverDenverSprint Spectrum L.p.Wireless1999-10-13
720-364DenverDenverNew Cingular Wireless Pcs, LlcWireless2002-01-15
720-365DenverDenverNew Cingular Wireless Pcs, LlcWireless2002-01-15
720-366DenverDenverNew Cingular Wireless Pcs, LlcWireless2002-01-15
720-367Lone TreeDouglasXo Colorado, LlcLandline2004-12-13
720-368Lone TreeDouglasXo Colorado, LlcLandline2004-04-30
720-369DenverDenverNew Cingular Wireless Pcs, LlcWireless2011-03-14
720-370DenverDenverBandwidth.com Clec, LlcLandline2013-01-04
720-371DenverDenverSprint Spectrum L.p.Wireless1999-10-13
720-372AuroraAdamsT-Mobile Usa, Inc.Wireless2013-09-09
720-373DenverDenverSprint Spectrum L.p.Wireless1999-10-13
720-374AuroraArapahoeQwest CorporationLandline2000-06-13
720-375DenverDenverCommnet Wireless, LlcWireless2007-07-10
720-376DenverDenverEschelon Telecom Of Colorado, Inc.Landline2012-11-12
720-377AuroraArapahoeXo Colorado, LlcLandline2000-01-14
720-378LongmontBoulderNew Cingular Wireless Pcs, LlcWireless2010-01-19
720-379AuroraArapahoeIcg Telecom GroupLandline2000-08-20
720-380DenverDenverSprint Spectrum L.p.Wireless2013-02-01
720-381DenverDenverComcast Phone Of Colorado, LlcLandline2005-08-03
720-382DenverDenverEschelon Telecom Of Colorado, Inc.Landline2000-08-20
720-383Fort LuptonWeldCellco Partnership Dba Verizon WirelessWireless2008-11-13
720-384DenverDenverXo Colorado, LlcLandline2000-08-20
720-385DenverDenverXo Colorado, LlcLandline2000-08-20
720-386Idaho SpringsClear CreekBandwidth.com Clec, LlcLandline2012-12-03
720-387DenverDenverTw Telecom Of Colorado LlcLandline2012-09-04
720-388AuroraArapahoeCellco Partnership Dba Verizon WirelessWireless2010-01-11
720-389DenverDenverXo Colorado, LlcLandline2008-11-17
720-390DenverDenverIloka, Inc. Dba Newcloud NetworksLandline2013-07-18
720-391DenverDenverCellco Partnership Dba Verizon WirelessWireless2013-07-12
720-392Deer TrailArapahoeYmax Communications Corp.Landline2009-01-30
720-393DenverDenverTw Telecom Of Colorado LlcLandline2010-06-07
720-394DenverDenverT-Mobile Usa, Inc.Wireless2001-03-03
720-395DenverDenverAt&t LocalLandline2009-09-04
720-396DenverDenverAt&t LocalLandline2009-09-08
720-397DenverDenverAt&t LocalLandline2009-09-08
720-398DenverDenverNew Cingular Wireless Pcs, LlcWireless2010-06-28
720-399DenverDenverLevel 3 Communications, LlcLandline2011-05-06

Frequently asked questions

Where is area code 720?

Area code 720 serves Colorado, including Denver. It covers 21 cities across 9 counties, in the Mountain time zone.

What time is it in area code 720?

Area code 720 observes Mountain time (UTC-07:00). The current local time is approximately 1:41 PM.

When was area code 720 introduced?

The earliest phone prefix recorded in area code 720 was put in service on 1999-02-27. The most recent was activated on 2015-09-28.

Is a call from 720 safe to answer?

Our directory holds 2,968 caller reports covering 757 numbers in area code 720. A valid area code does not guarantee a legitimate caller, since numbers can be spoofed.

What cities are in area code 720?

The largest places served by area code 720 are Denver, Aurora, Longmont, Aurora, Denver, Denver, Lone Tree, Brighton. In total it covers 21 cities across 9 counties.

How is a 720 phone number written?

A number in this area code is written +1 (720) XXX-XXXX in international format, or (720) XXX-XXXX domestically. The +1 is the country code shared by the United States, Canada and other NANP members.

Can scammers fake a 720 number?

Yes. Caller ID was built without verification, so a caller can display almost any number. Scammers often pick a number matching the area code of the person they are calling — known as neighbour spoofing — because a local-looking call is answered more often. The US industry response, STIR/SHAKEN, lets carriers sign and verify caller ID, but coverage is still incomplete.

Why do I get calls from numbers with my own area code?

Almost always neighbour spoofing: the caller fabricates a number sharing your area code, and sometimes your prefix, so the call looks like it comes from someone nearby. A matching area code is not evidence that the caller is local.

How do I report a spam call from 720?

Report unwanted calls to the FTC at reportfraud.ftc.gov, and add your number to the Do Not Call registry at donotcall.gov. Include the caller ID number even if you believe it was spoofed — regulators use the pattern of reports, not the individual number.

Other area codes in Colorado

Area code 30321 citiesArea code 71976 citiesArea code 970108 cities

Where this data comes from

Different parts of this page carry different levels of reliability. Here is what each one rests on.

DataBased onReliabilityCovers
Area code & prefix dataNANPA prefix recordshighcompiled 2018
Caller reportsconsumer-submitted reportsconsumer-reported2015–2017 archive
Directory listingsYPState archivehigh2004–2020
Business recordscommercial business registermediumcompiled 2018

About the caller reports: these were submitted by members of the public and are not verified. They record what a caller ID displayed and what the recipient made of the call — they are not proof of who owns a number, and because caller ID can be faked, a reported number may have nothing to do with the person actually calling.

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