Prairie Grove is a village in McHenry County, Illinois, United States, first incorporated in 1973. Per the 2020 census, the population was 1,963. Though Prairie Grove had been inhabited by settlers since the early 19th century in an area known as Barreville, the Village of Prairie Grove was incorporated in 1973. Since 2004, Prairie Grove has been a home rul…Prairie Grove is a village in McHenry County, Illinois, United States, first incorporated in 1973. Per the 2020 census, the population was 1,963. Though Prairie Grove had been inhabited by settlers since the early 19th century in an area known as Barreville, the Village of Prairie Grove was incorporated in 1973. Since 2004, Prairie Grove has been a home rule community.
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