Tulsa, Broken Arrow, and Owasso anchor the 918 area code, covering roughly 29 counties across northeastern Oklahoma. It's been in service since 1953, when it split off from 405 as Oklahoma's original single area code ran out of room — and in 2011 it became the state's very first overlay territory when 539 joined the same footprint.
This guide covers 918's counties and cities, how its reach spreads from Tulsa's core out to smaller outer towns, the split-then-overlay history that shaped it, what's driving demand in a region built on energy and tribal government, and how much numbering room is left.
Counties and cities at a glance
| City | County | Region |
|---|---|---|
| Tulsa | Tulsa | Metro core |
| Broken Arrow | Tulsa/Wagoner | Southeast suburbs |
| Owasso | Tulsa/Rogers | North suburbs |
| Bartlesville | Washington | Northern outer towns |
| Muskogee | Muskogee | Southeast outer towns |
| Tahlequah | Cherokee | Eastern outer towns, Cherokee Nation capital |
From Tulsa's core to the outer towns
918 doesn't stop at Tulsa's city limits — it spreads across three loose bands. The metro core (Tulsa itself) sits at the center, a band of inner suburbs (Broken Arrow, Owasso, Jenks, Sapulpa) surrounds it, and an outer band of smaller cities and tribal territory (Bartlesville, Muskogee, Claremore, Tahlequah, McAlester) stretches out to where 918 gives way to Oklahoma's other regional codes.
From a 1953 split to Oklahoma's first overlay
1953 — 918 split off from 405, Oklahoma's original statewide area code, covering the entire northeastern part of the state.
April 1, 2011 — 539 launched as an all-services overlay on the same 918 footprint — the first overlay ever introduced in Oklahoma. Mandatory ten-digit dialing began just weeks earlier, on March 5, 2011.
Ready when you are
Protect your business line.
MCM's local numbers ship with verified caller ID and smart call filtering — customers always know it's really you, and spam never reaches your team.
What's driving demand across northeastern Oklahoma
Tulsa's economy has long been shaped by energy, with newer industries layered on top:
Energy and oil Tulsa's history as the "Oil Capital of the World" still anchors a large base of energy-sector offices and suppliers.
Aerospace A growing aerospace and manufacturing sector adds commercial lines across the metro.
Cherokee Nation government Tahlequah serves as the capital of the Cherokee Nation, anchoring a significant base of tribal-government and related business lines.
Many of these northeastern Oklahoma businesses are moving their phone systems onto UCaaS (Unified Communications as a Service) — one cloud platform for calling, video, and messaging that scales as a company adds offices across the region, the same pattern behind newer overlays like 915 in El Paso, Texas. Contact us to set up a 918 or 539 number for your Oklahoma business.
Number availability across 918/539
As Oklahoma's first overlay territory, 918/539's numbering pressure reflects just how much Tulsa's metro area grew before 2011 — the combined pool now has considerably more headroom than 918 alone had left in the years leading up to the overlay.
Time zone & how to dial a 918 number
Northeastern Oklahoma runs on Central Time (CT) — CST (UTC −6) in winter, CDT (UTC −5) during Daylight Saving Time. Ten-digit dialing has been mandatory since March 5, 2011: dial 1, then the area code, then the seven-digit number, for every local call.
Key takeaways
- 918 covers roughly 29 counties across northeastern Oklahoma — Tulsa, Broken Arrow, and Owasso — since 1953.
- It became Oklahoma's first-ever overlay territory when 539 launched on April 1, 2011.
- Anchors include the energy industry, aerospace, and the Cherokee Nation's tribal government in Tahlequah.
- Both 918 and 539 cover identical territory at identical rates.
- Time zone: Central (CT), with mandatory 10-digit dialing since March 2011.
Ready when you are
Ready to sound local everywhere you sell?
MCM activates business numbers in minutes, with call routing, analytics, and CRM-ready integrations. Start your free trial — no card to browse inventory.
Frequently asked questions
What is the 918 area code?
It covers northeastern Oklahoma, including Tulsa, Broken Arrow, and Owasso, and has been active since 1953.
Where is the 918 area code located?
Roughly 29 counties across northeastern Oklahoma, including Tulsa, Muskogee, Washington, and Cherokee counties.
Is 918 a Florida area code?
No. It has never been assigned to Florida — this is strictly an Oklahoma code.
What state is the 918 area code in?
Oklahoma — specifically the northeastern part of the state, anchored by Tulsa.
What time zone is the 918 area code?
Central Time Zone (CT) — CST (UTC −6) in winter and CDT (UTC −5) during Daylight Saving Time.
Why does northeastern Oklahoma have two area codes, 918 and 539?
539 was added in 2011 as an overlay — Oklahoma's first — after regulators determined 918 would run short on numbers due to Tulsa-area growth.
How do I get a 918 area code number?
Sign up with a VoIP provider such as My Country Mobile, search for available numbers in either code, choose a northeastern Oklahoma prefix, select a plan, and activate.
