Saint Clair County USGS O'Fallon Quad, Illinois, Topographic Map

Saint Clair County is a Civil in the state of Illinois (county of St. Clair), located at latitude - longitude coordinates (also known as lat-long or GPS coordinates) of N 38.55005 and W -89.91677. Saint Clair County is shown in the center of the topographic (topo) map, which is sourced from the United States Geographical Survey map USGS O'Fallon quad. The nearest major town is O'Fallon, IL.