Colorado area codes
Colorado has 6 active area codes. The original 1947 code was 303. The newest is 748 (2025).
The busiest codes by active prefixes are 720 (Denver), 303 (Denver), 970 (Fort Collins), 719 (Colorado Springs), 983 (Denver).
2 overlay complexes operate in Colorado: 303/720/983, 748/970. Inside a complex the codes share territory and local calls take ten digits.
Since 2010 the state has gained 2 codes: 983 (2022), 748 (2025).
Every Colorado code keeps Mountain time.
303, in service since 1947, anchors Denver, carries 784 active prefixes across 13 rate centers, split among 27 carriers. 228 of its prefixes are pooled — shared between carriers in thousands-number blocks. It is the oldest area code in Colorado, in service since 1947. NANPA projects its capacity to last until 2Q 2069 — no relief needed for decades. Local dialing is ten digits.
719, in service since 1988, anchors Colorado Springs, carries 663 active prefixes across 75 rate centers, split among 65 carriers. 447 of its prefixes are pooled — shared between carriers in thousands-number blocks. NANPA projects its capacity to last until 3Q 2035. It was created from 303. Local dialing is ten digits.
720 has served Denver since 1998, carries 785 active prefixes across 12 rate centers, split among 46 carriers. 653 of its prefixes are pooled — shared between carriers in thousands-number blocks. NANPA projects its capacity to last until 2Q 2069 — no relief needed for decades. It was created from 303. Local dialing is ten digits.
748 has served Colorado since 2025. NANPA projects its capacity to last until 4Q 2088 — no relief needed for decades. It was created from 970. Local dialing is ten digits.
970 has served Fort Collins since 1995, carries 769 active prefixes across 120 rate centers, split among 60 carriers. 520 of its prefixes are pooled — shared between carriers in thousands-number blocks. It is covers more rate centers (120) than any other Colorado area code. NANPA projects its capacity to last until 4Q 2088 — no relief needed for decades. It was created from 303. Local dialing is ten digits.
983, in service since 2022, anchors Denver, carries 38 active prefixes across 6 rate centers, split among 17 carriers. 35 of its prefixes are pooled — shared between carriers in thousands-number blocks. NANPA projects its capacity to last until 2Q 2069 — no relief needed for decades. It was created from 303. Local dialing is ten digits.
Numbers in the toll-free 8YY family are absent here by design: they carry no state assignment and answer anywhere in the US, Canada and the Caribbean.
Use the per-code pages to go deeper — coverage by locality, full prefix tables for the most-searched codes, and NANPA's capacity forecasts for each.
| Code | Major area | In service | Overlay complex | Prefixes |
|---|---|---|---|---|
| 303 | Denver | 1947 | 303/720/983 | 784 |
| 719 | Colorado Springs | 1988 | — | 663 |
| 720 | Denver | 1998 | 303/720/983 | 785 |
| 748 | — | 2025 | 748/970 | — |
| 970 | Fort Collins | 1995 | 748/970 | 769 |
| 983 | Denver | 2022 | 303/720/983 | 38 |
FAQ
How many area codes does Colorado have?
6 geographic area codes are currently in service: 303, 719, 720, 748, 970, 983.
What was Colorado's first area code?
303, in service since 1947.
Will Colorado get a new area code soon?
Not soon. The earliest exhaust forecast in the state is 719 at 3Q 2035, so current codes have ample capacity.
Which time zone are Colorado numbers in?
All Colorado area codes are in the Mountain time zone.