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Monongahela Historical Society About Us Gallery Why We Need To Do It. Historic Preservation Community Development Love Of Community Latest From Our Blog What To Do In Monongahela Pennsylvania One of the most beautiful things about this place is its river. The Monongahela River is incredibly beautiful and I will be listing out some things you can do here Some Interesting Tidbits About Monongahela Pennsylvania In this article Im going to be talking all about Monongahela Pennsylvania. It has a population of a little above 4200.