| Boulder, Illinois | |
|---|---|
|   Boulder, Illinois   Boulder, Illinois | |
| Coordinates: 38°41′48″N 89°13′32″W / 38.69667°N 89.22556°W | |
| Country | United States | 
| State | Illinois | 
| County | Clinton | 
| Elevation | 466 ft (142 m) | 
| Time zone | UTC-6 (Central (CST)) | 
| • Summer (DST) | UTC-5 (CDT) | 
| Area code | 618 | 
| GNIS feature ID | 404717[1] | 
Boulder is an unincorporated community in Clinton County, Illinois, United States. Boulder is located on the eastern shore of Carlyle Lake; a railroad line crosses the lake from Boulder to Keyesport.
References
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