MONROE, a city of Louisiana, the parish-seat of Ouachita on the Ouachita river, the Arkansas, Louisiana and Gulf, the Vicksburg, Shreveport and Pacific, the St. Louis, Iron Mountain and Southern railroads. It has government buildings, a sanitarium, city hall, good schools, and parks. There is a considerable trade in cotton, and there are cotton seed mills, cotton compressors, manufactories of automobiles, wagons, bricks, lumber, etc. Pop. (1910) 10,209; (1920) 12,675.