Area code 539 is an overlay for area code 918 in northeastern Oklahoma, including Tulsa, Broken Arrow, and Muskogee. Introduced in 2011, it supports the increasing demand for numbers in the region’s urban and suburban areas. Tulsa is a major cultural and economic hub, known for its history in oil, growing tech industry, and vibrant arts scene. Ten-digit dialing is mandatory. Area code 539 represents the continuing expansion of eastern Oklahoma, complementing 918 while contributing to a shared identity rooted in progress, resilience, and Midwestern pride.