About This Place
Mars is a borough in Butler County, Pennsylvania, USA. The population was 1,746 at the 2000 census.
Mars is located at 40°41′48″N 80°0′44″W / 40.69667°N 80.01222°W / 40.69667; -80.01222 (40.696594, -80.012205).
According to the United States Census Bureau, the borough has a total area of 0.4 square miles (1.0 km2), all of it land.