North American Numbers Source-cited · ownership disclosed
Area code
405
In service
United States · since 1947

Oklahoma City

One of the original 1947 area codes and the numbering plan for central Oklahoma anchored by Oklahoma City. It is overlaid by 572 and is the only Oklahoma area code that does not border another state.

The essentials Numbering data · NumberResearch · as of 2026-09-18
Place
Oklahoma City
Type
geographic
Status
in service
In service since
1947
Projected exhaust
2055 Q2

Status, dates and counts are read from NumberResearch (NANPA / CNAC / FCC records). Assignment records show initial assignees, not the carrier serving a number today.

A · Where it is

Where 405 is

Central Oklahoma — the Oklahoma City metropolitan area and surrounding central counties..

Communities served wholly or partly by 405:

Oklahoma CityNormanEdmondMooreStillwaterGuthrieShawnee
B · Relationships

How it relates to other codes

The codes 405 was split from, spawned, or shares its area with. A split divides the map and changes some numbers; an overlay shares the same ground and changes none — what's the difference?

Spawned · 1953 918 Tulsa Northeastern Oklahoma (Tulsa) split off from 405 on January 1, 1953.
Spawned · 1997 580 Lawton / western & southern Oklahoma Western and southern Oklahoma split off from 405 on November 1, 1997.
Overlay · 2021 572 Oklahoma City (overlay) All-service overlay covering the same central-Oklahoma geography.
What's changing. Overlaid by 572 (both codes serve the same central-Oklahoma area); ten-digit dialing required.
C · History

How 405 got here

1947
Assigned as one of the original North American area codes, covering the entire state of Oklahoma.
Source: Wikipedia
1953-01-01
Northeastern Oklahoma split off as area code 918.
Source: Wikipedia
1997-11-01
Southern and western Oklahoma split off as area code 580, reducing 405 to central Oklahoma.
Source: Wikipedia
2021-01
Mandatory ten-digit dialing began with activation of the 572 overlay.
Source: Wikipedia
D · Capacity

How full it is

Prefixes assigned
800
Prefixes available
0
Thousands-blocks assigned
4,019

Prefix-assignment counts describe allocation to carriers, not how many individual numbers are in use. Full technical records: NumberResearch ↗.

Compare 405 with another code →
Sources
Wikipedia ↗
Area code 405
NumberResearch.org ↗
Live status, dates, assignment counts and exhaust forecast — data as of 2026-09-18 (CC BY 4.0).

Place, relationships and history above are compiled by North American Numbers from the sources listed and last checked 2026-09-18. A check date is not an expert review — see how this is made. Flag an error.