COLORADO · AREA CODE GUIDE
303, 720, and 983 area codes location: Denver, Colorado
- Local date and time
- Mountain Time
Map data: UCLA Geoportal (2015) · NANPA · US Census Bureau, checked 26 September 2026. Boundaries are approximate.
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Download the 720 area code map
303, 720, and 983 area codes at a glance
- State
- Colorado
- Primary cities
- Denver, Longmont, and Fort Lupton
- Time zone
- Mountain Time
- Answering calls
- Rules for answering calls in Colorado
An area code does not show where a caller is now.
| Area code | Started service | Parent code | New code planned |
|---|---|---|---|
| 303 | No, as of 22 September 2026 | ||
| 720 | 303 | No, as of 22 September 2026 | |
| 983 | 303 | No, as of 22 September 2026 |
History
Counties and cities covered
These are telephone exchange areas, which follow the phone network rather than city limits.
Counties of the communities we could place (the code may reach further): Adams County, Arapahoe County, Boulder County, Clear Creek County, Denver County, and Weld County.
- Denver
- Longmont
- Fort Lupton
- Bennett
- Keenesburg
- Deer Trail
- Hudson
- Georgetown
- Allenspark-Lyons
- Byers
- Deckers
- Roggen
- Strasburg
Sources: NANPA area code listing, NANPA places by area code, U.S. Census Bureau county geography. Checked .
Business phone numbers in area codes 303, 720, and 983, answered by an AI agent
A local number for Denver, Longmont, and Fort Lupton, Colorado, with an AI receptionist that takes caller details, answers the questions you give it, and books appointments. Numbers depend on what carriers have left.