Boulder, Illinois

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Boulder, Illinois
Unincorporated community
Boulder, Illinois is located in Illinois
Boulder, Illinois
Boulder, Illinois
Coordinates: 38°41′48″N 89°13′32″W / 38.69667°N 89.22556°W / 38.69667; -89.22556Coordinates: 38°41′48″N 89°13′32″W / 38.69667°N 89.22556°W / 38.69667; -89.22556
Country United States
State Illinois
County Clinton
Elevation 466 ft (142 m)
Time zone Central (CST) (UTC-6)
 • Summer (DST) CDT (UTC-5)
Area code(s) 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.


  1. ^ "US Board on Geographic Names". United States Geological Survey. 2007-10-25. Retrieved 2008-01-31.