Lamar, Missouri, is a small city located in Barton County in the southwestern part of the state. It serves as the county seat and has a population of around 4,000 residents. The city is known for its rich history and is home to several historic buildings and sites, including the Lamar Courthouse. Lamar is also recognized as the birthplace of Harry S. Truman, the 33rd President of the United States. The city features parks, local shops, and community events that contribute to its small-town charm. Its location along U.S. Route 71 makes it accessible for travelers exploring the region.