Monroe, Ohio Monroe, Ohio Monroe is a city located in east central Butler and west central Warren counties in the southwestern part of the U.S. state of Ohio. As of the 2010 Census, the city population was 12,442, up from 4,008 in 1990. Monroe was laid out in 1817 on the Dayton and Cincinnati pike. The city is named for President James Monroe, fifth President of the United States. In the early 1830s, Monroe contained one store and 119 inhabitants. Monroe is located at (39.444658, −84.364044). According to the United States Census Bureau, the city has a total area of , of
James Monroe Family Home Site etchings of the birth home indicate a small four room, rough cut wooden farm house with few outbuildings on a 500-acre farm filled with wetlands. The archaeological study clearly indicated that James Monroe's beginnings were humble. It was listed on the National Register of Historic Places in 1979, with a boundary increase in 2008. James Monroe Family Home Site James Monroe Family Home Site, also known as James Monroe's Birthplace, is a historic archaeological site located near Oak Grove and Colonial Beach, Westmoreland County, Virginia. The site includes the ruins of the Monroe Family Home and birthplace of President James