Uhlerstown is an unincorporated community in Tinicum Township, Bucks County, Pennsylvania, United States. The community is located along Pennsylvania Route 32 (River Road) and is served by the 18920 ZIP Code. Uhlerstown is one of the many Delaware River communities in the county. In 1949, painter Frederick Harer died here. Uhlerstown actually uses the post office and ZIP Code of nearby Erwinna; therefore, many Uhlerstown residents say that they are from Erwinna, as that is what shows up on their addresses.