Seward is a city and county seat of Seward County, Nebraska, United States. The population was 7,643 at the 2020 census. Seward is par…Seward is a city and county seat of Seward County, Nebraska, United States. The population was 7,643 at the 2020 census. Seward is part of the Lincoln, Nebraska Metropolitan Statistical Area. Seward was platted in 1868. It was named from Seward County. The railroad was built through Seward in 1873.