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.
Though Prairie Grove had been inhabited by settlers since the early 19th century, the Village of Prairie Grove was incorporated in 1973. Since 2004, Prairie Grove has been a home rule community.
Prairie Grove is served by Prairie Grove School District 46 and Crystal Lake Community Consolidated School District 47, both of which are for students through 8th grade, and Community High School District 155, specifically Prairie Ridge High School, for students in high school.
Prairie Grove is located at 42°16′37″N 88°16′10″W (42.2768346, -88.2693750). According to the 2010 census, Prairie Grove has a total area of 5.714 square miles (14.80 km2), of which 5.71 square miles (14.79 km2) (or 99.93%) is land and 0.004 square miles (0.01 km2) (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.