Liberal is the county seat of Seward County, Kansas, United States. As of 2024, the population of the city was 18,743. It is located in southwest…Liberal is the county seat of Seward County, Kansas, United States. As of 2024, the population of the city was 18,743. It is located in southwestern Kansas, along U.S. Route 54 highway, near the Kansas-Oklahoma state line. Liberal is the home of Seward County Community College.