Geo quick facts: Barton County is a county located in the southwestern part of the U.S. state of Missouri. As of the 2020 census, the population was 11,637. Its county seat is Lamar. The county was organized in 1855 and named after U.S. Senator David Barton from Missouri. President Harry S. Truman was born in Barton County in 1884 – Wikipedia.
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