| Site | State | Type | Population |
|---|---|---|---|
| Chesterfield, VA | Virginia | City | 3558 |
| Cheyenne County, NE | Nebraska | County | 9676 |
| Cheyenne, WY | Wyoming | City | 65051 |
| Chicago Heights, IL | Illinois | City | 29598 |
| Chicago, IL | Illinois | City | 2697000 |
| Chicopee, MA | Massachusetts | City | 55190 |
| Chillicothe, OH | Ohio | City | 22009 |
| Chilton County, AL | Alabama | County | 44147 |
| China Spring, TX | Texas | City | 1264 |
| Chino Hills, CA | California | City | 78822 |
| Chino, CA | California | City | 92975 |
| Chippewa Falls, WI | Wisconsin | City | 14197 |
| Chittenden County, VT | Vermont | County | 168869 |
| Christian County, MO | Missouri | County | 87324 |
| Chula Vista, CA | California | City | 277260 |
| Cicero, IL | Illinois | City | 83161 |
| Cincinnati, OH | Ohio | City | 311791 |
| Circleville, OH | Ohio | City | 14106 |
| Citrus County, FL | Florida | County | 147938 |
| Citrus Heights, CA | California | City | 87402 |
| Clackamas County, OR | Oregon | County | 415084 |
| Clairton, PA | Pennsylvania | City | 6574 |
| Claremont, CA | California | City | 35610 |
| Claremore, OK | Oklahoma | City | 19419 |
| Clark County, IN | Indiana | County | 117410 |
| Clark County, NV | Nevada | County | 2229000 |
| Clark County, WA | Washington | County | 511404 |
| Clarksburg, WV | West Virginia | City | 15784 |
| Clarkstown, NY | New York | City | 86631 |
| Clarksville, IN | Indiana | City | 21825 |
| Clarksville, TN | Tennessee | City | 170953 |
| Clay County, FL | Florida | County | 212230 |
| Clay County, MO | Missouri | County | 255518 |
| Clayton County, GA | Georgia | County | 297100 |
| Clayton Township, MI | Michigan | City | 7226 |
| Clear Lake, IA | Iowa | City | 7594 |
| Clearwater, FL | Florida | City | 116682 |
| Cleburne, TX | Texas | City | 31999 |
| Clermont County, OH | Ohio | County | 205616 |
| Clermont, FL | Florida | City | 44530 |
| Cleveland Heights, OH | Ohio | City | 44650 |
| Cleveland, OH | Ohio | City | 385282 |
| Cleveland, TN | Tennessee | City | 47955 |
| Clewiston, FL | Florida | City | 7327 |
| Clifton Park, NY | New York | City | 38153 |
| Clifton, NJ | New Jersey | City | 89367 |
| Clinton County, PA | Pennsylvania | County | 39238 |
| Clinton Township, OH | Ohio | City | 4102 |
| Clinton Township, PA | Pennsylvania | City | 3719 |
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