Barnhart is a cdp located in Jefferson County, in the state of Missouri (MO), United States. Nestled in the West North Central division of the Midwest region, it covers an area of 5.1 square miles (13.0 km²) and sits at an elevation of 435 ft. With a population of approximately 6,108 residents, Barnhart offers a peaceful, rural atmosphere.
The town's population is composed of about 50.92% males and 49.08% females, and it has a population density of 188.33 people per square mile (458.82/km²). Barnhart lies at a latitude of 38.34 and a longitude of -90.4, operating in the UTC-6.
Locals reflect a blend of American ancestry, with roots primarily in United States (7.8%), followed by English (10.2%), German (37.3%), and Scotch-Irish (0%) heritage. The town is identified by the ZIP code 63012.