Oklahoma 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 5 Oklahoma codes.

Aggregate footprint: the state's 5 geographic codes currently carry 2,645 active NXX prefixes over 697 rate-center anchorings, with 1,903 prefixes in thousands-block pooling. 5 of the codes serve territory inside FCC top-100 metropolitan statistical areas.

Lineage: 539 came out of 918 in 2011; 572 came out of 405 in 2021; 580 came out of 405 in 1997. The remaining codes (405, 918) date back to the plan's early assignments.

Dialing plans: 4 codes use plain ten-digit local dialing (10D); 1 still allows seven-digit local calls. 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 580, projected to exhaust 3Q 2029.

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

Code-by-code notes

405 — spawned 580, 572; overlaid by 572; exhaust forecast 2Q 2055.

918 — spawned 539; overlaid by 539; exhaust forecast 2Q 2048.

580 — carved from 405; exhaust forecast 3Q 2029.

539 — carved from 918; overlaid by 918; exhaust forecast 2Q 2048.

572 — carved from 405; overlaid by 405; exhaust forecast 2Q 2055.