Harry S. Truman Birthplace State Historic Site Only Missourian elected U.S. President was born here May 8, 1884. He was the 33rd President, serving 1945-53. Six-room frame structure was built 1880-1882 Lamar, MO Famous Homes Historic Plaza Theatre Lamar, MO Theatres Lamar Aquatic Park Southwest Missouri's most exciting water park. Features: 5 Lamar, MO Water Parks Barton County Historical Society Lamar, MO Museums Lamar Country Club Course Access: Semi-PrivateHoles: 9Reserve Advance Tee Times: Lamar, MO Golf Courses