North American Numbers Source-cited · ownership disclosed
Area code
918
In service
United States · since 1953

Tulsa

The numbering plan for northeastern Oklahoma anchored by Tulsa, split from 405 in 1953. It was the first Oklahoma area code to receive an overlay (539) in 2011.

The essentials Numbering data · NumberResearch · as of 2026-09-18
Place
Tulsa
Type
geographic
Status
in service
In service since
1953
Projected exhaust
2048 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 918 is

Northeastern Oklahoma — the Tulsa metropolitan area and a large multi-county region extending toward the Arkansas and Missouri borders..

Communities served wholly or partly by 918:

TulsaBroken ArrowBartlesvilleMuskogeeClaremoreSapulpaTahlequahMcAlesterOkmulgee
B · Relationships

How it relates to other codes

The codes 918 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?

Split from · 1953 405 Oklahoma City Split from the original 405 on January 1, 1953.
Overlay · 2011 539 Tulsa (overlay) All-service overlay covering the same northeastern-Oklahoma geography.
What's changing. Overlaid by 539 (both codes serve the same northeastern-Oklahoma area); ten-digit dialing required.
C · History

How 918 got here

1953-01-01
Established by splitting northeastern Oklahoma from area code 405.
Source: Wikipedia
2011-04-01
Overlay area code 539 went into service — the first overlay in Oklahoma.
Source: Wikipedia
D · Capacity

How full it is

Prefixes assigned
799
Prefixes available
1
Thousands-blocks assigned
2,970

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

Compare 918 with another code →
Sources
Wikipedia ↗
Area code 918
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.