Properties in Monessen. Find real estate listings including single family homes, townhouses, condos, multi-family dwellings, vacant land listed by REALTORS®
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Monessen is a city in Westmoreland County , Pennsylvania , United States . The population was 8,669 at the 2000 census. In 1940 , 20,257 people lived there. Steel-making was a prominent industry in Monessen, which was a Rust Belt borough in the "Mon Valley" of southwestern Pennsylvania that became a third-class city in 1921. It is not a far piece from Charleroi and Donora , two similar places with similar histories.