Clear Lake is a village in Sangamon County, Illinois, United States. The population was 267 at the 2000 census. It is part of the Springfield, Illinois Metropolitan Statistical Area.
Clear Lake is located at 39°48′51″N 89°34′1″W / 39.81417°N 89.56694°W / 39.81417; -89.56694 (39.814177, -89.566965).
According to the 2010 census, Clear Lake has a total area of 0.11 square miles (0.28 km), all land.
As of the census of 2000, there were 267 people, 104 households, and 79 families residing in the village. The population density was 2,871.8 people per square mile (1,145.4/km²). There were 111 housing units at an average density of 1,193.9 per square mile (476.2/km²). The racial makeup of the village was 96.25% White, 1.12% African American, 1.12% Asian, 0.75% from other races, and 0.75% from two or more races. Hispanic or Latino of any race were 1.87% of the population.
There were 104 households out of which 35.6% had children under the age of 18 living with them, 53.8% were married couples living together, 13.5% had a female householder with no husband present, and 23.1% were non-families. 22.1% of all households were made up of individuals and 9.6% had someone living alone who was 65 years of age or older. The average household size was 2.57 and the average family size was 2.90.
In the village, the population was spread out with 27.0% under the age of 18, 4.5% from 18 to 24, 32.2% from 25 to 44, 25.1% from 45 to 64, and 11.2% who were 65 years of age or older. The median age was 39 years. For every 100 females, there were 89.4 males. For every 100 females age 18 and over, there were 89.3 males.
The median income for a household in the village was $37,708, and the median income for a family was $40,536. Males had a median income of $35,625 versus $30,278 for females. The per capita income for the village was $15,284. About 18.4% of families and 14.1% of the population were below the poverty line, including 24.6% of those under the age of eighteen and 22.9% of those sixty five or over.