Grantsburg, Illinois | |
|---|---|
  Grantsburg  Grantsburg | |
| Coordinates: 37°23′27″N 88°44′49″W / 37.39083°N 88.74694°W | |
| Country | United States |
| State | Illinois |
| County | Johnson |
| Elevation | 367 ft (112 m) |
| Time zone | UTC-6 (Central (CST)) |
| • Summer (DST) | UTC-5 (CDT) |
| ZIP code | 62943 |
| Area code | 618 |
| GNIS feature ID | 409314[1] |
Grantsburg is an unincorporated community in Johnson County, Illinois, United States. Grantsburg is located on Illinois Route 146 near the Shawnee National Forest, east of Vienna. Grantsburg has a post office, with the ZIP code 62943.[2]