| Official Name: | Ridgefield, Illinois |
| Settlement Type: | Census-designated place |
| Pushpin Map: | Illinois#USA |
| Pushpin Label: | Ridgefield |
| Pushpin Label Position: | left |
| Subdivision Type: | Country |
| Subdivision Name: |  United States |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | McHenry |
| Subdivision Type3: | Township |
| Subdivision Name3: | Dorr |
| Unit Pref: | Imperial |
| Area Footnotes: | [1] |
| Area Total Km2: | 1.35 |
| Area Land Km2: | 1.35 |
| Area Water Km2: | 0.00 |
| Area Total Sq Mi: | 0.52 |
| Area Land Sq Mi: | 0.52 |
| Area Water Sq Mi: | 0.00 |
| Population As Of: | 2020 |
| Population Total: | 210 |
| Population Density Km2: | 155.10 |
| Population Density Sq Mi: | 401.53 |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation Ft: | 938 |
| Coordinates: | 42.2683°N -88.3614°W |
| Area Code: | 815 & 779 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 416644 |
Ridgefield is an unincorporated community and census-designated place in McHenry County, Illinois, United States. Ridgefield is 3miles northwest of Crystal Lake. It was named a CDP before the 2020 census, at which time it had a population of 210.[2]
Ridgefield hosts a small number of antique shops in a small crossroads business district. Ridgefield also has a large grain storage facility and a retail hardware store. Metra commuter trains pass through Ridgefield on their way to Chicago from Woodstock, Illinois without stopping, though there are currently shelved plans to build a station here.
A post office called Ridgefield was first established in 1858.[3] The community was named from the ridges near the town site.[4]
Ridgefield first appeared as a census designated place in the 2020 U.S. Census.
| White alone (NH) | 193 | 91.90% | |
| Black or African American alone (NH) | 0 | 0.00% | |
| Native American or Alaska Native alone (NH) | 0 | 0.00% | |
| Asian alone (NH) | 0 | 0.00% | |
| Pacific Islander alone (NH) | 1 | 0.48% | |
| Some Other Race alone (NH) | 0 | 0.00% | |
| Mixed Race or Multi-Racial (NH) | 2 | 0.95% | |
| Hispanic or Latino (any race) | 14 | 6.67% | |
| Total | 210 | 100.00% |