West Monroe is a city in Ouachita Parish, Louisiana, United States. It is part of the Monroe Metropolitan Statistical Area. West Monroe is situated on the Ouachita River, just across from the neighboring city of Monroe. The two cities are often referred to as the Twin Cities of northeast Louisiana. According to the United States Census Bureau, the city has a total area of 8.0square miles (20.6Square kilometers), of which, 7.7square miles (20.0Square kilometers) is land and 0.2square miles (0.6Square kilometers) (3.14%) is water.