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is a northern suburb of Chicago in Lake County, Illinois, United States. It is located 5 miles from Lake Michigan, and is on the Des Plaines River. The population was 20,742 at the 2000 census, and estimated to be 21,760 as of 2005. (There is also a township of the same name, which includes the village and some surrounding areas.) Located in northeastern Illinois to the southwest of Waukegan and the northwest of Lake Forest, its immediate neighbors are Mundelein to the west and Vernon Hills to the south.
Terry Weppler was elected mayor of Libertyville on April 8, 2009. He defeated incumbent Mayor Jeffrey Harger, 71 percent to 29 percent.
According to the United States Census Bureau, the village has a total area of 9.1 square miles (23.5 km²), of which 8.8 square miles (22.7 km²) is land and 0.3 square miles (0.8 km²) is water. The total area of Libertyville is 3.20% water.
The Des Plaines River forms much of the eastern boundary of the village. Other bodies of water include Lake Minear, Butler Lake and Liberty Lake.
Libertyville's main street is Milwaukee Avenue. The main route to Chicago is Interstate 94; Chicago's Loop is approximately 45 miles away.