918 area code
Tulsa area, Central Time.Area code 918 covers Tulsa, Broken Arrow, Muskogee and 177 more places in Oklahoma, on Central Time. 539 covers the same area.
Right now in Tulsa
Central Time (CST, UTC-6; CDT, UTC-5 in summer)
Calling hours: Every day, 8 AM to 8 PM (Oklahoma law)
Small talk
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Where 918 numbers come from
Numbers are issued by rate center, a billing area named for its main town. 918 has 180. Each one's share is how many 918 numbers start there. Its biggest metro area is Tulsa, OK.
- Tulsa35%
- Broken Arrow4%
- Muskogee4%
- Bartlesville3%
- Tahlequah3%
- McAlester2%
Also: Jenks, Owasso, Miami, Sallisaw, Catoosa, Poteau, Vinita, Claremore, Cushing, Pryor, Bixby, Okmulgee + 162 more
Share of exchanges (blocks of 10,000 numbers). Source: NANPA rate center and exchange reports, November 10, 2026
When can you call a 918 number?
Sales calls to homes and cell phones have legal hours, set by Oklahoma law. Hold every 918 number to them, since you can't tell a work line from a personal cell.
What applies to 918Every day, 8 AM to 8 PM
- Federal (TCPA and FTC rule)Every day, 8 AM to 9 PMCalls to residential and mobile numbers. Most calls to businesses are exempt from the FTC's rule.47 CFR 64.1200(c)(1); 16 CFR 310.4(c) (opens in a new tab)
- Oklahoma lawEvery day, 8 AM to 8 PMAlso no more than 3 calls in 24 hours on the same subject.15 O.S. 775C.4 (opens in a new tab)
Local time comes from the area code, not from where the person is today. Mobiles keep their number when they move. Calling hours here are a guide, not legal advice. Every state's calling hours, with sources
918 and 539
918 went into service on January 1, 1953. 918 and 539 cover the same area, so new numbers can get either code and neighbors can have different area codes. 918 holds 77% of the area's exchanges; 539 holds the rest. Local calls take all 10 digits.
- 1953918 starts
- 2011539 overlay
Source: NANPA area code database
Other Oklahoma area codes
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918 area code FAQ
What area code is 918?
918 is an Oklahoma area code for Tulsa, Broken Arrow, Muskogee, Bartlesville and 176 more places.
What time zone is the 918 area code in?
Central Time (CST, UTC-6; CDT, UTC-5 in summer).
Is 539 the same as 918?
Same area, different code. 918 and 539 cover the same area (an overlay), so new numbers can get any of them and local calls take all 10 digits.
What are the calling hours for 918 numbers?
Every day, 8 AM to 8 PM, local time, under Oklahoma law.
When did the 918 area code start?
On January 1, 1953.
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