St Clair County lies in east central Missouri on the Meramec River Valley near St Louis City limits containing 990 square miles of forested rolling hills countryside.. The county seat has one hundred year old architecture that provides an ideal backdrop for many events like antique car shows at Frank Osborn Field or hot air balloon races at top 5 rated Sauter Park that are held each year across this picturesque region filled with open fields to explore or small towns full of local charm offering family fun history tours or eco-tours through vineyards or lakeside cabins with lots of recreation areas filled outdoor recreation opportunities not easily found elsewhere like horseback riding rock climbing bird watching biking hiking camping canoeing rafting kayaking skiing ice skating boating tubing jet skiing windsurfing sailing water skiing snowmobiling hunting fishing golf all available minutes away from your closest city crossing any nearby state boundary lines too.