Missouri 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 9 Missouri codes.

Aggregate footprint: the state's 9 geographic codes currently carry 4,114 active NXX prefixes over 757 rate-center anchorings, with 3,223 prefixes in thousands-block pooling. 9 of the codes serve territory inside FCC top-100 metropolitan statistical areas.

Lineage: 235 came out of 573 in 2024; 557 came out of 314 in 2022; 573 came out of 314 in 1996; 636 came out of 314 in 1999; 660 came out of 816 in 1997; 975 came out of 816 in 2023. The remaining codes (314, 417, 816) date back to the plan's early assignments.

Dialing plans: 8 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 417, projected to exhaust 2Q 2032.

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

Code-by-code notes

573 — spawned 235; carved from 314; overlaid by 235; exhaust forecast 3Q 2063.

816 — spawned 660, 975; overlaid by 975; exhaust forecast 3Q 2069.

314 — spawned 573, 636, 557; overlaid by 557; exhaust forecast 4Q 2060.

417 — exhaust forecast 2Q 2032.

660 — carved from 816; exhaust forecast 2Q 2103.

636 — carved from 314; exhaust forecast 3Q 2075.

557 — carved from 314; overlaid by 314; exhaust forecast 4Q 2060.

235 — carved from 573; overlaid by 573; exhaust forecast 3Q 2063.

975 — carved from 816; overlaid by 816; exhaust forecast 3Q 2069.