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 Hewlett American Institute of Architects, Director of the American Academy in Rome, and Chairman of the Committee for erecting Carnegie Libraries in Brooklyn. James Monroe Hewlett was the father-in-law of Buckminster Fuller and is credited with the creation of the mural of the heavens on the ceiling of Grand Central Station in New York City. James Monroe Hewlett James "Monroe" Hewlett (August 1, 1868 – October 18, 1941) was an American Beaux Arts architect, scenic designer, and muralist. Hewlett was born into an old Long Island family at Rock Hall in Lawrence, New York. He is descended from a long line