918 area code — Tulsa, OK geographic

Data: NANPA public reports, current as of July 28, 2026.

Phone numbers beginning 918 are registered to the Tulsa area of Oklahoma (Central time zone). The code entered service on January 1, 1953. It is part of the 539/918 overlay complex — these codes share the same territory. Note that porting and VoIP mean a 918 number can be used from anywhere — the code marks where the number was assigned.

782 central-office prefixes are currently active in this code, spread across 56 code-holding carriers. Thousands-block pooling applies to 506 prefixes, so a single prefix can belong to several carriers. Its prefixes map to 181 distinct rate centers.

To check where a specific 918 number was issued, look up its six-digit prefix; to check who is actually calling, ignore the display and verify through an official callback number — caller ID is assertable and routinely spoofed.

It has since spawned 539 (2011).

NANPA projects numbering capacity for the 539/918 complex to exhaust in 2Q 2048.

Dialing: 10D locally, 10D to other codes.

Largest localities in 918

FAQ

Why am I getting spam calls from 918 numbers?

Scammers spoof recognizable area codes so calls look local or familiar. A displayed 918 number does not prove the call originated there — see our guide to spotting spoofed calls.

Where is a 918 number from?

918 is assigned to Tulsa and surrounding areas of Oklahoma in the Central time zone. The three digits after the area code (the prefix) narrow it down to a rate center.

Is 918 a toll-free number?

No. 918 is a geographic code; calls are billed like any other domestic call. Toll-free codes are 800, 833, 844, 855, 866, 877 and 888.

Why do 539 and 918 cover the same place?

They are overlays: when a code runs low on numbers, a new code is added over the same territory instead of splitting it. The 539/918 complex shares one service area, and local calls are dialed with 10 digits.