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Area code Verified Nov 1, 2026 · Source: NANPA

Area code 720 – Colorado

720 has served Colorado since 1998, split from 303. All but a handful of its 786 number blocks are allocated (785 of 786), so it is effectively exhausted. No carrier dominates: Lumen / CenturyLink 21.7%, T-Mobile 16.8%, AT&T 16.4%. It shares its geography with overlay codes 303, 983, so local calls take all ten digits. It is also among the most imitated codes in spam calls: 1,150 FTC complaints named a 720 caller ID in the 33 days to 30 October 2026, ranking 24th of 422 ranked codes.

State
Colorado
In service since
1998
Time zone
Mountain
Shares area with
303, 983

Who holds 720 number blocks

Share of the 785 assigned NXX blocks (99.9% of the 786 possible), across 45 carriers. This is share of number blocks, not of subscribers.

  • Lumen21.7%
  • T-Mobile18%
  • AT&T16.4%
  • Verizon16.1%
  • Onvoy7%
  • Bandwidth7%
  • Other CLEC / VoIP4.3%
  • Comcast2.7%
  • Allstream2.2%
  • Windstream1.3%
  • Peerless1.1%
  • Vonage0.9%
  • Charter0.6%
  • Telnyx0.4%
  • American Messaging0.1%
  • Twilio0.1%
  • VoIP Innovations0.1%

Spam complaints naming 720

FTC Do Not Call complaints where the caller ID was a 720 number, 28 Sep – 30 Oct 2026 (33 days). Caller IDs on spam calls are frequently spoofed, so these are complaints about the code, not calls proven to originate in it.

1,150 complaints in 33 days
#24 of 422 ranked codes

Rate centers in 720

NANPA allocates number blocks to rate centers and records their names abbreviated to ten characters, so these are NANPA's codes rather than place names – CHAMPAURBN is Champaign-Urbana, NWYRCYZN01 is a New York City zone. We show them unchanged instead of guessing at the full names. Showing the largest 5 of 12.

DENVER678
LONGMONT39
FORTLUPTON14
GEORGETOWN11
ALLNSPKLYN10

Timeline

  1. 1998 720 goes into service, split from or overlaid on 303.

More about 720

Separate pages for the questions that need their own answer: what time it is there, what the complaint data says, who holds the number blocks, and how the code compares with the one it shares its area with.

All prefixes Every one of the 785 assigned NXX blocks, with the holder of each Local time Zone, UTC offset, clock changes and a live clock Spam complaints How often the code appears in FTC complaints, and what to do Carriers Who holds the number blocks, and why that is not who serves them 720 vs 303 Same area, different code – age, capacity and complaints side by side 720 vs 983 Same area, different code – age, capacity and complaints side by side

Frequently asked about 720

What state is area code 720?

Colorado. It covers the same area as 303/720/983.

Can I still get a 720 number?

Only from recycled stock. 785 of the 786 available blocks are already allocated, so new numbers in the area normally come from the overlay codes (303/720/983).

Is a call from 720 a scam?

720 is one of the most complained-about codes in the country – 1,150 FTC complaints in the 33 days to 30 October 2026, 24th of 422 ranked codes. Most of those calls are spoofed: the caller fakes a local-looking number because it gets answered more often. Look up the specific number rather than judging by the code.

Which carrier owns 720 numbers?

Lumen / CenturyLink holds the largest share of assigned number blocks at 21.7%. The rest is spread across 3 other carriers. This is share of number blocks, not of subscribers – people keep their numbers when they switch carriers.

Do I need to dial 10 digits in 720?

Yes – ten digits for local calls in 720, because it shares its area with another code.

Sources and verification

NANPA dialing note for this code: “10D”. Reviewed by the data desk. Spotted an error? Request a correction.

Nearby and related

303 Colorado303 Colorado983 Colorado