|— Unincorporated community —|
|Elevation||377 ft (115 m)|
|Time zone||Central (CST) (UTC-6)|
|• Summer (DST)||CDT (UTC-5)|
|GNIS feature ID||409314|
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 ZIP code 62943.
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