St. Louis County is located in the eastern-central portion of Missouri. It is bounded by the City of St. Louis and the Mississippi River to the east, the Missouri River to the north, and the Meramec River to the south. Wikipedia
Cities: Chesterfield, Clayton, Kirkwood, and more
Population: 990,414 (2022)
Congressional districts: 1st, 2nd
Founded: October 1, 1812
Largest city: Florissant
Seat: Clayton