St. Peters is a city in St. Charles County, Missouri, United States. The 2010 census showed the city's population to be 52,575, tied for 10th place in Missouri with Blue Springs. Interstate 70 passes through the city, providing a major transportation link. In 2008, St. Peters was named the 60th best place to live by Money magazine, putting it at the top in the state of Missouri. It also ranked in Money magazine's Top 100 in 2010, 2012 and 2017. The "Rec-Plex" in St. Peters recreation and fitness complex underwent an $18.5 million expansion in 2007. The city also hosts the county's largest shopping center, Mid Rivers Mall.
