| Dennison | |
| Settlement Type: | Unincorporated community |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Illinois |
| Subdivision Type2: | County |
| Subdivision Name2: | Clark |
| Pushpin Map: | Illinois#USA |
| Pushpin Map Caption: | Location of Dennison within Illinois |
| Coordinates: | 39.4608°N -87.5978°W |
| Elevation Ft: | 577 |
| Population As Of: | 2000 |
| Population Density Km2: | auto |
| Timezone1: | CST |
| Utc Offset1: | -6 |
| Timezone1 Dst: | CDT |
| Utc Offset1 Dst: | -5 |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 407130 |
| Postal Code Type: | Postal code |
| Postal Code: | 62423 |
Dennison is an unincorporated community in Wabash Township in the northeast corner of Clark County, Illinois, east of Illinois Route 1 and north of Interstate 70.
Dennison is located at 39°27'39" North, 87°35'52" West (39.4608688, -87.5978025).[1]