Plymouth is a suburban city in the U.S. state of Minnesota 15 miles west of downtown Minneapolis in Hennepin County. Located in the far western suburbs, the city is Minnesota's seventh largest city. According to the 2019 Metropolitan Council estimate, Plymouth's population is 79,768. The population was 70,576 at the 2010 Census. Once named for Medicine Lake, the city's name was chosen by Hennepin County Commissioners during the county's inception.