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 of Virginia and rose to national prominence as a diplomat in France when he helped negotiate the Louisiana Purchase in 1803. During the War of 1812, Monroe served in critical roles as Secretary of State and the Secretary of War under President James Madison. Facing little opposition from the waning Federalist Party, Monroe was easily elected president in 1816, winning over eighty percent against Rufus King (who hadn't even been chosen by a convention since the Federalists were too weak to organize) of the electoral vote and becoming the last president during the First Party System era of American politics.