Mars is a borough in southern Butler County, Pennsylvania, United States. The population was 1,458 at the 2020 census. It is part of the Pittsburgh metropolitan area. In 1873, Samuel Parks constructed a home and a water-powered gristmill along Breakneck Creek. Parks decided to have a post office placed in his home, so he received help from his friend Sa…Mars is a borough in southern Butler County, Pennsylvania, United States. The population was 1,458 at the 2020 census. It is part of the Pittsburgh metropolitan area. In 1873, Samuel Parks constructed a home and a water-powered gristmill along Breakneck Creek. Parks decided to have a post office placed in his home, so he received help from his friend Samuel Marshall to help establish it. The name of the post office became Overbrook. In 1877, the Pittsburgh, New Castle and Lake Erie Railroad was constructed through Overbrook, and had a station built there. In 1882, the name of the community was changed to Mars since the railroad already had a stop with the name "Overbrook". No one is sure how the name "Mars" came into being. Some say it was Parks's wife who enjoyed astronomy, while others believe it was shortened after Samuel Marshall's name. On March 6, 1895, Mars was incorporated as a borough.
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