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Area code 720

Area code 720 serves Colorado, including Denver, Longmont and Fort Lupton (Mountain time). It has been in service since June 1, 1998 and shares its area with 303 and 983.

Numbers starting with 720 drew 2,627 reports to the FTC from Aug 14, 2026 to Nov 11, 2026 and 1,528 complaints to the FCC since November 2023. The number on your screen can be faked, so a 720 number proves nothing about where a call came from.

Location
ColoradoDenver-Aurora-Centennial, CO Metropolitan Statistical Area
Time zone
Mountain
In service since
June 1, 1998Created from 303
Overlay
Same area as 303, 983
Local calls
Dial 10 digitsArea code needed, even next door
Exchanges in use
785 of 792held by 45 carriers
Projected to run out
3Q 2070NANPA forecast 2026.2

Complaints about 720 numbers

Reports where the number on the consumer's caller ID (or, for the FCC, the number the caller asked them to call back) starts with 720. These are counts of what people reported; the agencies do not verify them.

FTC reports, Aug 14, 2026 to Nov 11, 2026

2,627

FCC complaints since November 2023

1,528

Different 720 numbers reported

3,691

FCC complaints naming a 720 number, by month

November 2023 to October 2026. Source: FCC Consumer Complaints Data.

Show as a table
MonthComplaints
November 202329
December 202326
January 202429
February 202427
March 202424
April 202432
May 202450
June 202483
July 202425
August 202424
September 202430
October 202439
November 202436
December 202431
January 202535
February 202532
March 202547
April 202546
May 202555
June 202538
July 202535
August 202552
September 202541
October 20252
November 202519
December 202525
January 202646
February 202621
March 202631
April 202670
May 202642
June 202648
July 202648
August 202652
September 202679
October 2026139

What people said 720 calls were about

Subjects picked in FTC reports, August 14, 2026 to November 11, 2026. 1,527 of 2,627 reports were robocalls.

Show as a table
SubjectReports
Other1,221
Reducing your debt (credit cards, mortgage, student loans)279
Dropped call or no message228
Calls pretending to be government, businesses, or family and friends225
Medical and prescriptions170
Home improvement and cleaning142

Most reported 720 numbers

Numbers with at least five reports from three or more places in the last twelve months. Many of them are likely spoofed.

Places served by 720

NANPA lists 12 rate centers for 720. A rate center is the town or district a block of numbers is tied to for billing; sorted here by how many exchanges each holds.
  • Denver678
  • Longmont39
  • Fort Lupton14
  • Georgetown11
  • Allenspark-Lyons10
  • Deckers10
  • Keenesburg9
  • Hudson8
  • Deer Trail3
  • Bennett1
  • Byers1
  • Strasburg1

Phone companies holding 720 exchanges

Each exchange (the three digits after the area code) is assigned to one carrier. 83% of these exchanges are pooled: their numbers are handed out in blocks of 1,000 to other carriers, so the holder below is not always the company serving a given number.

Exchanges held, top 8 of 45 carriers

NANPA central office code assignments, file of November 11, 2026.

Show as a table
Carrier (legal name)Exchanges
T-Mobile USA, Inc.132
Qwest Corporation103
New Cingular Wireless PCS, LLC92
Cellco Partnership dba Verizon Wireless - CO75
Bandwidth.com CLEC, LLC - CO55
Onvoy, LLC - CO55
Mcimetro Access Transmission Services LLC51
Level 3 Communications, LLC - CO48

When today's 720 exchanges were assigned

Exchanges still assigned, by year of assignment. Exchanges returned since are not counted.

Show as a table
YearExchanges
200135
200212
20032
20045
20051
20063
20073
200813
200923
201039
201134
201227
201330
201454
201530
201623
201725
201821
201934
202030
202125
202230
20234
20245

Check a 720 number

A check shows the carrier and rate center of the number's exchange and every FTC and FCC report about that exact number. Why the number on screen can be fake.

Other area codes in Colorado

NANPA area code database and central office code file of November 11, 2026; FCC complaints November 1, 2023 to November 11, 2026; FTC reports August 14, 2026 to November 11, 2026. How the data is used.

Official sources (7)Show