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Area code 720

Area code 720 Denver, Colorado

Area code 720 is in Colorado, with numbers assigned in Denver, Longmont, Fort Lupton and 7 more places. It’s 10:10 PM there now.

State
Colorado6 area codes in Colorado
Time zone
Mountain10:10 PM there now
Exchanges
78510 places
Overlay
303 and 983Same area, 10-digit dialing
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Where area code 720 is

Numbers in 720 are assigned to 10 places in 6 counties: Denver County, Weld County, Boulder County, Clear Creek County, Arapahoe County and Adams County.

Denver holds most of them: 86% of the exchanges.

  • Denver678
  • Longmont39
  • Fort Lupton14
  • Georgetown11
  • Keenesburg9
  • Hudson8
  • Deer Trail3
  • Strasburg1
  • Byers1
  • Bennett1

Phone companies in 720

785 blocks of numbers in 720 are held by 42 phone companies. The most belong to T-Mobile (141), Lumen (CenturyLink) (107) and AT&T Mobility (92).

A large share, about 44%, belongs to competitive and internet phone carriers; wireless networks hold 39% and local phone and cable companies 17%.

A block’s holder is the company it was first assigned to; numbers can move to other carriers since.

History and overlays

720 went into service in 1998, added to the area of 303.

303 (since 1947) and 983 (since 2022) share the same area, so a new number there can get any of these codes and local calls are dialed with all 10 digits.

64 new exchanges were assigned since 2021, the latest in September 2024.

Calling 720

It’s 10:10 PM Mountain time in 720 right now.

From elsewhere in the U.S., dial 1, 720 and the 7-digit number; inside the area, all 10 digits too.

Nearby area codes

Colorado has 6 area codes: 303, 719, 720, 748, 970 and 983.

From the North American Numbering Plan Administrator’s area code and exchange records (10/22/2026) and U.S. Census place and county names. Places and companies are where number blocks were assigned, not where anyone lives or which carrier a number uses today.

Map of the 720 area code

Map of the 720 area code around Denver, Longmont and Fort Lupton, Colorado.

Interactive map © OpenStreetMap contributors

Cities on the map

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Questions about 720

Where is area code 720?

In Colorado, covering Denver, Longmont and Fort Lupton and other places across 6 counties.

What time zone is 720 in?

Mountain time. It was 10:10 PM there when this page loaded.

Is 720 an overlay?

Yes. 303 and 983 serve the same area, so dial all 10 digits for local calls.

Which phone companies have 720 numbers?

42 companies hold blocks; the most belong to T-Mobile, Lumen (CenturyLink) and AT&T Mobility. About 39% of blocks are wireless.

Is 720 running out of numbers?

Not on record. 64 new exchanges have been assigned since 2021.