Colorado area codes — detailed data

NANPA NPA database, current as of July 28, 2026.

This page expands the state overview with per-code operational data from NANPA: parent codes, projected exhaust dates, dialing patterns and relief status for all 6 Colorado codes.

Aggregate footprint: the state's 6 geographic codes currently carry 3,039 active NXX prefixes over 226 rate-center anchorings, with 1,883 prefixes in thousands-block pooling. 4 of the codes serve territory inside FCC top-100 metropolitan statistical areas.

Lineage: 719 came out of 303 in 1988; 720 came out of 303 in 1998; 748 came out of 970 in 2025; 970 came out of 303 in 1995; 983 came out of 303 in 2022. The remaining code (303) dates back to the plan's early assignments.

Dialing plans: 6 codes use plain ten-digit local dialing (10D). Overlay territories always dial ten digits; the 2021 988-hotline transition moved most others to ten digits as well.

The tightest capacity in the state is 719, projected to exhaust 3Q 2035.

Status: no Colorado code is currently in jeopardy or active relief planning — capacity is adequate near-term per NANPA.

Code-by-code notes

720 — carved from 303; overlaid by 303/983; exhaust forecast 2Q 2069.

303 — spawned 719, 970, 720, 983; overlaid by 720/983; exhaust forecast 2Q 2069.

970 — spawned 748; carved from 303; overlaid by 748; exhaust forecast 4Q 2088.

719 — carved from 303; exhaust forecast 3Q 2035.

983 — carved from 303; overlaid by 303/720; exhaust forecast 2Q 2069.

748 — carved from 970; overlaid by 970; exhaust forecast 4Q 2088.