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
Monroe, Michigan Arbor-Flint combined statistical area, and the city is sometimes unofficially included as a northerly extension of the Toledo Metropolitan Area. The Monroe area saw several military conflicts during the War of 1812 with Great Britain and is best remembered for the Battle of Frenchtown. In 1817, portions of the Frenchtown settlement along the River Raisin were platted and renamed Monroe after then-president James Monroe. When Michigan became a state in 1837, Monroe was incorporated as a city. Monroe is known as the childhood residence of George Armstrong Custer and other members of his family, including his brother Boston Custer and