Monroeville Allegheny CountyPennsylvania www.monroeville.pa.us Map Population 27,393 (2020)Area 19.72 sq mi (51.06 km²), 0.01 sq mi waterGovernment MUNICIPALITY OF MONROEVILLEGovernment office 2700 MONROEVILLE BLVD, MONROEVILLE, PA 15146