Boulder, Illinois
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
Municipalities and communities of Clinton County, Illinois, United States | ||
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| Cities |  | |
| Villages | ||
| Townships | ||
| Unincorporated communities | ||
| Ghost town | ||
| Footnotes | ‡This populated place also has portions in an adjacent county or counties | |
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