Louisiana area codes — detailed data

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

Full numbering detail for every active Louisiana area code: lineage (which code it split from), NANPA exhaust projections, dialing plans and jeopardy status. This is the working data behind the overview page.

Aggregate footprint: the state's 6 geographic codes currently carry 2,852 active NXX prefixes over 277 rate-center anchorings, with 2,101 prefixes in thousands-block pooling. 4 of the codes serve territory inside FCC top-100 metropolitan statistical areas.

Lineage: 225 came out of 504 in 1998; 337 came out of 318 in 1999; 457 came out of 318 in 2025; 985 came out of 504 in 2001. The remaining codes (318, 504) date back to the plan's early assignments.

Dialing plans: 4 codes use plain ten-digit local dialing (10D); 2 still allow 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 337, projected to exhaust 2Q 2053.

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

Code-by-code notes

318 — spawned 337, 457; overlaid by 457; exhaust forecast 3Q 2095.

337 — carved from 318; exhaust forecast 2Q 2053.

504 — spawned 225, 985; exhaust forecast 3Q 2061.

225 — carved from 504; exhaust forecast 3Q 2054.

985 — carved from 504; exhaust forecast 2Q 2103.

457 — carved from 318; overlaid by 318; exhaust forecast 3Q 2095.