Putnam County, Illinois
Putnam County is the smallest county in Illinois, covering just 160 square miles. It’s tucked away in the north-central part of the state. Hennepin, the county seat, sits along the Illinois River.
The county is a mix of rolling hills and river bottomlands. It’s mostly rural, with farms scattered across the landscape. Its small size and population give Putnam County a tight-knit feel.
The Illinois River along the western side provides opportunities for fishing and boating. Nearby Hennepin Canal State Park is popular for hiking and biking. A couple of highways wind through the county, making it easy to get around.
| Category | Details |
|---|---|
| County Name | Putnam County |
| County Seat | Hennepin |
| Etymology | Named after General Israel Putnam |
| Cities, Towns, and Communities | Hennepin, McNabb, Granville, and several unincorporated communities |
| Interstates and Highways | Illinois Route 26, Illinois Route 71, Illinois Route 89 |
| FIPS Code | 17-155 |
| Total Area (Land and Water) | 163 square miles (land: 155 sq mi, water: 8 sq mi) |
| Adjacent Counties (and Direction) | Bureau County (Northwest), LaSalle County (East), Marshall County (South) |
| Time Zone | Central Time Zone (CT) |
| Population | Approximately 5,800 |
| State | Illinois |
| Coordinates | 41.2791° N, 89.2496° W |
| Major Landmarks | Starved Rock State Park, Illinois River, and the Putnam County Historical Society Museum |
