Monroe County, Illinois
Lat/Long: 38.2833, -90.1833
Carved out of Randolph and St. Clair counties, Monroe County, named in honor of President James Monroe, was established in 1816 before Illinois statehood. The American Bottom, below St. Louis and along the Mississippi River, runs through the county, and Waterloo is the seat of government.
Illinois Counties and Incorporated Municipalities (Springfield: Illinois Secretary of State, 2012), 2; John M. Peck, A Gazetteer of Illinois in Three Parts (Jacksonville, IL: R. Goudy, 1834), 6, 146-47; James N. Adams, comp., Illinois Place Names (Springfield: Illinois State Historical Library, 1989), 595.