720 area code
Area code 720 is in Colorado. It covers Denver, Aurora, Lakewood and 120 other places: 182 ZIP codes in Denver, Arapahoe, Jefferson and 7 other counties. Local time there is , Mountain Time. In service since 1998 as an overlay: it covers the same area as 303 and 983, so a number from there can have any of them.
Who calls from a 720 number
NANPA records the carrier each block of 720 numbers is assigned to. Of the 7.8 million 720 numbers assigned, 47% are with mobile carriers (T-Mobile, Verizon Wireless and AT&T Mobility); 41% with cable, internet-calling, business and other carriers (Onvoy and Bandwidth); 12% with local phone companies (Qwest (CenturyLink)).
That is who the numbers were assigned to: people keep their number when they change carrier, so any one number may have moved since.
| Carrier | Kind | Share |
|---|---|---|
| T-Mobile | Mobile | 21% |
| Verizon Wireless | Mobile | 14% |
| AT&T Mobility | Mobile | 12% |
| Qwest (CenturyLink) | Landline | 12% |
| Onvoy | Cable, VoIP, other | 11% |
| Bandwidth | Cable, VoIP, other | 8% |
An area code says where a number was issued, not where the caller is: people keep their numbers when they move, and caller ID can be set to show any number, which the FCC calls spoofing. If a call you did not expect asks for money or personal details, the FCC advises hanging up and calling the company back on a number you look up yourself. Unwanted calls can be reported to the FTC at ReportFraud.ftc.gov.
Places in area code 720
The 9 places with a telephone rate centre of their own using 720, largest first. Each links to its ZIP codes.
| Place | ZIP codes | Population |
|---|---|---|
| Denver, CO | 66 | 718,877 |
| Longmont, CO | 4 | 99,406 |
| Fort Lupton, CO | 1 | 8,897 |
| Bennett, CO | 1 | 3,663 |
| Strasburg, CO | 1 | 3,455 |
| Keenesburg, CO | 1 | 2,347 |
| Hudson, CO | 1 | 2,006 |
| Byers, CO | 1 | 1,726 |
| Deer Trail, CO | 1 | 1,275 |
Nearby places using 720
These places have no rate centre of their own in NANPA's records; the nearest one uses 720. Near an area-code boundary that can be wrong for part of a town.
- Aurora
- Lakewood
- Thornton
- Arvada
- Westminster
- Centennial
- Boulder
- Highlands Ranch
- Broomfield
- Commerce City
- Parker
- Littleton
- Brighton
- Northglenn
- Englewood
- Erie
- Dakota Ridge
- Ken Caryl
- Wheat Ridge
- Lafayette
- Columbine
- Four Square Mile
- Louisville
- Golden
- Sherrelwood
- Frederick
- Welby
- Greenwood Village
- Lone Tree
- Federal Heights
- Henderson
- Castle Pines
- Superior
- The Pinery
- Berkley
- Cherry Creek
- Gunbarrel
- Fairmount
- Roxborough Park
- Stonegate
- Lochbuie
- Evergreen
- Derby
- Applewood
- Conifer
- Dacono
- Cherry Hills Village
- Sheridan
- Meridian
- Shaw Heights
- Todd Creek
- West Pleasant View
- Edgewater
- Dove Valley
- Glendale
- Castle Pines Village
- Sterling Ranch
- Genesee
- Sierra Ridge
- Niwot
ZIP codes in area code 720
182 ZIP codes in 46 towns, by the town each is mailed to, largest first. Each links to its own page.
- Denver
- 80201, 80202, 80203, 80204, 80205, 80206, 80207, 80208, 80209, 80210, 80211, 80212, 80214, 80215, 80216, 80217, 80218, 80219, 80220, 80221, 80222, 80223, 80224, 80225, 80226, 80227, 80228, 80229, 80230, 80231, 80232, 80233, 80234, 80235, 80236, 80237, 80238, 80239, 80243, 80244, 80246, 80247, 80248, 80249, 80250, 80251, 80252, 80256, 80257, 80259, 80260, 80261, 80262, 80263, 80264, 80265, 80266, 80271, 80273, 80274, 80281, 80290, 80291, 80293, 80294, 80299
- Aurora
- 80010, 80011, 80012, 80013, 80014, 80015, 80016, 80017, 80018, 80019, 80040, 80041, 80042, 80044, 80045, 80046, 80047
Where 720 numbers are issued
NANPA's rate centres with the most 720 prefixes (each prefix is 10,000 numbers), under NANPA's own abbreviated names.
| Rate centre | Place | Prefixes |
|---|---|---|
DENVER | Denver | 678 |
LONGMONT | Longmont | 39 |
FORTLUPTON | Fort Lupton | 14 |
GEORGETOWN | — | 11 |
ALLNSPKLYN | — | 10 |
DECKERS | — | 10 |
Counties
The counties of its ZIP codes, most residents first, with how many of its ZIP codes each has.
- Denver County (53)
- Arapahoe County (28)
- Jefferson County (32)
- Adams County (26)
- Boulder County (23)
- Douglas County (9)
- Weld County (7)
- Broomfield County (2)
- Clear Creek County (1)
- Gilpin County (1)
Which code covers where you are now? What area code am I in? answers from your location.
Questions about area code 720
Where is area code 720?
Area code 720 is in Colorado. It covers Denver, Aurora, Lakewood and 120 other places: 182 ZIP codes in Denver, Arapahoe, Jefferson and 7 other counties.
What ZIP codes are in area code 720?
182 ZIP codes, by the town each is mailed to: Denver (66, 80201 to 80299), Aurora (17, 80010 to 80047), Thornton (80241), Arvada (7, 80001 to 80007) and 42 more towns. The full list is on this page.
What time zone is area code 720 in?
Mountain time.
Is a 720 number a mobile or a landline?
It can be either. 47% of 720 numbers are assigned to mobile carriers and 12% to local phone companies (NANPA, 2026-10-10); the rest are with cable, internet-calling, business and paging carriers. A number keeps its area code when it moves to another carrier.
What area codes overlay 720?
303 and 983. They cover the same area as 720, so a new number there can be given any of them.
Does a 720 number mean the caller is in Colorado?
Not necessarily. An area code says where the number was first issued. People keep their numbers when they move or switch carriers, and calling software can show any number, so a 720 call can come from anywhere.
Other area codes in Colorado
All 6 Colorado area codes, by area, with the cities each covers
Source: NANPA NPA database, central office code and thousands-block assignments, 2026-10-10. Places are matched to NANPA's rate centres by name; see sources.
Cite this page
zipcodes.pro. “Area code 720.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/area-code/720
Underlying data is public domain or openly licensed — sources, vintages and licences.