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Long Lake is an unincorporated community and census-designated place (CDP) in Lake County, Illinois, United States. The population was 3,515 at the 2010 census.
The community is in western Lake County and nearly surrounds Long Lake, which drains northwest via Squaw Creek to Fox Lake, part of the Chain O'Lakes of northern Illinois. The CDP is bordered to the northeast by the village of Round Lake Heights and to the east and south by the village of Round Lake Beach. The CDP is primarily in the eastern part of Grant Township, with a smaller portion in the northwest corner of Avon Township, and an area of about one city block in the southwest corner of Lake Villa Township.
Illinois Route 134 runs along the southern edge of the CDP, leading west 2 miles (3 km) to U.S. Route 12 in the southern part of Fox Lake village and southeast through Round Lake Beach 3.5 miles (5.6 km) to Hainesville. Long Lake is 46 miles (74 km) northwest of downtown Chicago.
According to the United States Census Bureau, the CDP has a total area of 1.6 square miles (4.1 km2), of which 1.0 square mile (2.6 km2) are land and 0.58 square miles (1.5 km2), or 36.72%, are water.
As of the census of 2000, there were 3,356 people, 1,150 households, and 857 families residing in the CDP. The population density was 3,193.3 people per square mile (1,234.1/km2). There were 1,237 housing units at an average density of 1,177.0/sq mi (454.9/km2). The racial makeup of the CDP was 93.33% White, 0.33% African American, 0.33% Native American, 0.72% Asian, 4.41% from other races, and 0.89% from two or more races. Hispanic or Latino of any race were 11.53% of the population.