Earth City is an unincorporated community located in St. Louis County, Missouri, United States, along Interstate 70, near the Missouri River. It is bounded by the city of Bridgeton on the east and north, the city of Maryland Heights to the south, and the Missouri River to the west. It is also near Lambert International Airport. The town is notable as being home to the headquarters of the Save-A-Lot grocery chain and a major UPS shipping hub. It also has a large business park bounded by I-70 on the south, I-270 on the east, and Missouri Route 370 to the north. It is within three miles of three major river-crossing bridges over the Missouri River.