| Official Name: | Harrison, Jackson County, Illinois |
| Settlement Type: | Census-designated place |
| Pushpin Map: | Illinois#USA |
| Pushpin Label: | Harrison |
| Pushpin Label Position: | top |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Illinois |
| Subdivision Type2: | County |
| Subdivision Name2: | Jackson |
| Subdivision Type3: | Township |
| Subdivision Name3: | Somerset |
| Unit Pref: | Imperial |
| Area Footnotes: | [1] |
| Area Total Km2: | 5.55 |
| Area Land Km2: | 5.45 |
| Area Water Km2: | 0.09 |
| Area Total Sq Mi: | 2.14 |
| Area Land Sq Mi: | 2.11 |
| Area Water Sq Mi: | 0.04 |
| Population As Of: | 2020 |
| Population Total: | 895 |
| Population Density Km2: | 164.08 |
| Population Density Sq Mi: | 424.98 |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation Ft: | 410 |
| Coordinates: | 37.7967°N -89.3369°W |
| Area Code: | 618 |
| Blank Name: | FIPS code |
| Blank Info: | 17-33162 |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 2628552 |
Harrison is a census-designated place in Jackson County, Illinois, United States. Its population was 970 as of the 2010 census.[2]