- Location: Johnson County, Illinois
- Legal status: Village
- Population: 133 (Change since 1990: +6.4%)
- Previously known as: Morgan's Mill
- Located northeast of Karnak and southwest of Vienna
- Latitude: 37°19'30" N (+37.3250)
- Longitude: 88°56'20" W (-88.9389)
- Elevation: 341 feet above sea level
- Public Land Survey: T. 14 S., R. 2 E., Sec. 1
- Civil township: Belknap
- Land area: 1.0 square miles
As the crow flies, Belknap is...
| Year | Population | Percent change |
|---|
| 1990 | 125 | -- |
| 2000 | 133 | +6.4% |