Concord is a census-designated place in St. Louis County, Missouri, United States. The population was 16,689 at the 2000 census. It should not be confused with Concord Township or Concord Village; the CDP shares much land with both, but these areas' boundaries are not identical. Concord apartments for rent comparison page shows most up to date rent information on Concord apartments and houses. Rent information is obtained from multiple rental sources but we cannot guarantee their accuracy.