There are 10 US Post Offices in Lincoln County serving a total of 31,476 residents equating to 3,148 residents per post office. It's estimated that approximately 50,239 packages are handled across the 10 county post offices annually. Lincoln County is a county located in eastern Central Oklahoma. As of the 2010 census, the population was 34,273. Its county seat is Chandler. Lincoln County is part of the Oklahoma City, OK Metropolitan Statistical Area. In 2010, the center of population of Oklahoma was located in Lincoln County, near the town of Sparks."