Manheim (Pennsylvania Dutch: Mannem) is a borough in Lancaster County, Pennsylvania, United States. The population was 4,858 at the 2010 census. Manheim was laid out William Stiegel in 1762 on a land tract in Rapho Township, Pennsylvania, though it wasn't incorporated until 1838. He set out to build an industrial empire and founded the Manheim Glassworks. After financial failure, he was forced to sell the development in 1775. After several failed attempts at resurrecting the Manheim Glassworks, it closed in 1780.