The area code 539 is located in Bartlesville, Oklahoma.
Area code 539 serves Bartlesville and the wider northeast region of Oklahoma as an overlay to area code 918. It covers the same geographic area as 918, so both codes appear across the region without changing boundaries, and 10-digit dialing is required for all local calls. Bartlesville sits in Washington County, north of Tulsa and close to the Kansas border, known for its energy history and unique architecture. A standout local landmark is Price Tower, a rare high-rise designed by Frank Lloyd Wright, and the nearby Woolaroc Museum & Wildlife Preserve adds to the area’s cultural appeal.
Major cities and communities covered by the 539/918 overlay include:
The 539 overlay was introduced to meet rising demand for phone numbers in northeast Oklahoma. Mandatory 10‑digit dialing started in early 2011, and the first 539 numbers became available soon after. The region operates on Central Time (CT), and both wireless and landline carriers assign 539 numbers alongside 918. If you see a 539 phone number, it’s tied to this northeastern slice of Oklahoma, which blends small‑city life in Bartlesville with the larger urban hub of Tulsa.
“First 539 numbers were assigned on April 1, 2011.” — NANPA
“Mandatory 10-digit dialing for 918/539 began March 5, 2011.” — Oklahoma Corporation Commission