Pevely is a city in Jefferson County, Missouri, United States, and is also a suburb of St. Louis. The population was 6,107, at the 2020 United States Census.

Jefferson County is located in the eastern portion of the U.S. state of Missouri. It is a part of the St. Louis Metropolitan Area. As of the 2020 census, the population was 226,739, making it the sixth-most populous county in Missouri. Its county seat is Hillsboro. The county was organized in 1818 and named in honor of former president Thomas Jefferson.