Lincoln County is a county located in the U.S. state of Nebraska. As of the 2020 census, the population was 34,676. Its county seat is North Platte. Despite the county's name, the state capital city of Lincoln is not in or near Lincoln County. Lincoln County is one of the three counties in the North Platte Micropolitan Statistical Area. In the Nebraska license plate system, Lincoln County is represented by the prefix 15.