Fast Facts
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Monongahela is a Third Class City in Washington County, Pennsylvania, United States (zip Code 15063) and is part of the Pittsburgh Metro Area, located approximately 17 miles south of the city proper. The population was 4,761 at the 2000 census. In 1940, the population of Monongahela was 9,823, in 1950, 10,387, in 1960, 12,948, in 1970, 11,726, in 1980, 8,590, and in 1990.
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