is a city in St. Charles County, Missouri, United States. The official population estimate was 54,839 as of 2006. Interstate 70 passes through the city, providing a major transportation link. In 2008 St. Peters was dubbed the 60th best place to live by Money magazine, putting it at the top in the state of Missouri. The "Rec-Plex" in St. Peters is an award-winning recreation and fitness complex that underwent an $18.5 million expansion in 2007. The city also hosts the county's largest shopping center, Mid Rivers Mall, which plans a 120,000 sq. ft. expansion.
Prior to the arrival of Europeans, the area that would become St. Peters was inhabited by Mississippian mound builders. The remains of a village were uncovered during the construction of I-70 in 1954 and a street near the site was later named Mound Drive after the mounds built by the villagers.
Throughout most of the twentieth century, St. Peters was a small farming town. As recently as 1970, St. Peters had a population of only 486. The population rapidly increased to 15,700 by 1980 and within the span of a decade the community changed from a small rural town to a more suburban community. The city continued its rapid growth through the 1980s and by 1990 had a population of 40,660. St. Peters population increased to an estimated at 54,839 as of 2006. St.Peters celebrates its 50th year as a city in 2009, and its 100th year as a town in 2010, having become a town in 1910 and a city in 1959.