St. Louis County on the map of Missouri 2024. Cities, roads, borders and directions in St. Louis County of Missouri.

St. Louis County is the most populous county in Missouri. It is located on the western outskirts of St. Louis the city, but does not include it. The county seat here is Clayton and the largest city is Florissant. The total area of St. Louis County is 523 square miles. This map shows the borders of St. Louis County as well as neighboring counties, including major highways and natural objecsts as of 2024. Zoom in or out of the map using the plus/minus panel. Move the center of this map by dragging it. Also check out the satellite map of St. Louis County.