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 southwes…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 Kansas, along U.S. Route 54 highway, near the Kansas-Oklahoma state line. Liberal is home of Seward County Community College.