St. Charles County

I-70 West / I-64

St. Charles County, the fast-growing northwestern suburban county across the Missouri River from St. Louis County, anchored by St. Charles (the county seat and Missouri's first state capital, with a historic cobblestone Main Street), O'Fallon (the largest city in St. Charles County and one of the largest suburbs in the metro), St. Peters, Wentzville (home to the General Motors Assembly Plant that builds the Chevrolet Colorado and GMC Canyon pickups), Lake St. Louis, Dardenne Prairie, Cottleville, Weldon Spring, and Augusta (a historic wine country town).