Prairie Grove is a village in McHenry County, Illinois, United States, first incorporated in 1973. The population was 1,904 at the 2010 census. Prairie Grove’s schools and main social and economic life are shared with the city of Crystal Lake.
Prairie Grove is located at 42°16′37″N 88°16′10″W / 42.27694°N 88.26944°W / 42.27694; -88.26944 (42.2768346, -88.2693750).
According to the 2010 census, Prairie Grove has a total area of 5.714 square miles (14.80 km), of which 5.71 square miles (14.79 km) (or 99.93%) is land and 0.004 square miles (0.01 km) (or 0.07%) is water.
As of the census of 2000, there were 960 people, 303 households, and 262 families residing in the village. The population density was 207.2 people per square mile (80.1/km²). There were 308 housing units at an average density of 66.5 per square mile (25.7/km²). The racial makeup of the village was 96.98% White, 0.62% African American, 0.21% Native American, 1.04% Asian, 0.42% from other races, and 0.73% from two or more races. Hispanic or Latino of any race were 1.25% of the population.
There are households out of which 46.2% had children under the age of 18 living with them, 80.5% were married couples living together, 3.6% had a female householder with no husband present, and 13.5% were non-families. 7.9% of all households were made up of individuals and 2.3% had someone living alone who was 65 years of age or older. The average household size was 3.17 and the average family size was 3.37.
In the village, the population was spread out with 31.0% under the age of 18, 6.1% from 18 to 24, 29.4% from 25 to 44, 27.3% from 45 to 64, and 6.1% who were 65 years of age or older. The median age was 37 years. For every 100 females, there were 97.1 males. For every 100 females age 18 and over, there were 102.4 males.
The median income for a household in the village was $93,361, and the median income for a family was $102,087. Males had a median income of $70,417 versus $30,313 for females. The per capita income for the village was $36,234. None of the families and 1.3% of the population were living below the poverty line, including no under eighteens and none of those over 64.