Monongahela Township is a township in Greene County, Pennsylvania, United States. The population was 1,487 at the 2020 census, down from 1,572 at the 2010 census. Monongahela Township is the location of a prehistoric petroglyph site known as the "Sugar Grove Petroglyphs". Created by an unknown pre-Columbian indigenous people, the petro…Monongahela Township is a township in Greene County, Pennsylvania, United States. The population was 1,487 at the 2020 census, down from 1,572 at the 2010 census. Monongahela Township is the location of a prehistoric petroglyph site known as the "Sugar Grove Petroglyphs". Created by an unknown pre-Columbian indigenous people, the petroglyphs are an archaeological site, and they have been listed on the National Register of Historic Places.
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