Area codes 918 and 539, Telephone prefix zone in northeastern Oklahoma, US
Area codes 918 and 539 serve cities in northeastern Oklahoma such as Tulsa, Broken Arrow, Bartlesville, Claremore, and Muskogee. Both codes cover the same geographic region, with 539 functioning as an overlay to provide additional phone numbers for this growing area.
Area code 918 originated in 1947 as part of the original North American Numbering Plan system. Code 539 was introduced in 2011 to address the growing demand for telephone numbers in this region.
The telephone prefix region serves territories of several Native American nations, including the Cherokee Nation whose government seat is in Tahlequah. The area reflects the presence and ongoing presence of these communities across northeastern Oklahoma.
Residents and callers must dial ten digits when making calls within this area code region, as mandatory ten-digit dialing is required. This applies regardless of which code is being used.
The introduction of area code 539 marked the first overlay system in Oklahoma, allowing existing 918 numbers to remain unchanged. This approach made it possible to provide new phone numbers without disrupting the existing numbering system.
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