| Official Name: | Big Foot Prairie, Illinois |
| Settlement Type: | Census-designated place |
| Pushpin Map: | Illinois#USA |
| Pushpin Label: | Big Foot Prairie |
| Pushpin Label Position: | bottom |
| Subdivision Type: | Country |
| Subdivision Name: |  United States |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | McHenry |
| Subdivision Type3: | Township |
| Subdivision Name3: | Chemung |
| Unit Pref: | Imperial |
| Area Footnotes: | [1] |
| Area Total Km2: | 0.58 |
| Area Land Km2: | 0.58 |
| Area Water Km2: | 0.00 |
| Area Total Sq Mi: | 0.22 |
| Area Land Sq Mi: | 0.22 |
| Area Water Sq Mi: | 0.00 |
| Population As Of: | 2020 |
| Population Total: | 65 |
| Population Density Km2: | 112.22 |
| Population Density Sq Mi: | 290.18 |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation Ft: | 958 |
| Coordinates: | 42.495°N -88.5989°W |
| Postal Code Type: | ZIP Code |
| Postal Code: | 60033 (Harvard) |
| Area Codes: | 815 & 779 |
| Blank Name: | FIPS code |
| Blank Info: | 17-05859 |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 2806454 |
Big Foot Prairie is an unincorporated community and census-designated place in McHenry County, Illinois, United States. It was named a CDP for the 2020 census, at which time it had a population of 65.[2] It is located in Chemung Township.[3] Big Foot Prairie is located on U.S. Route 14, 5miles north of Harvard. The community extends north into Walworth County, Wisconsin, where there is a CDP of the same name in the town of Walworth.[4]
The community is named for Big Foot, a Potawatomi leader who resided on nearby Kishwauketoe (today Geneva Lake in Wisconsin) until his band was forcibly removed by the United States in 1836. It once had a post office, which opened on May 15, 1848.[5]
Big Foot Prairie first appeared as a census designated place in the 2020 U.S. Census.
| White alone (NH) | 28 | 43.08% | |
| Black or African American alone (NH) | 0 | 0.00% | |
| Native American or Alaska Native alone (NH) | 0 | 0.00% | |
| Asian alone (NH) | 1 | 1.54% | |
| Pacific Islander alone (NH) | 0 | 0.00% | |
| Some Other Race alone (NH) | 1 | 0.88% | |
| Mixed Race or Multi-Racial (NH) | 2 | 3.08% | |
| Hispanic or Latino (any race) | 34 | 52.31% | |
| Total | 65 | 100.00% |