| Site | State | Type | Population |
|---|---|---|---|
| Castle Rock, CO | Colorado | City | 76353 |
| Catonsville, MD | Maryland | City | 41592 |
| Cattaraugus County, NY | New York | County | 76426 |
| Cayuga County, NY | New York | County | 76248 |
| Cecil County, MD | Maryland | County | 103905 |
| Cedar City, UT | Utah | City | 35235 |
| Cedar Rapids, IA | Iowa | City | 133125 |
| Cedartown, GA | Georgia | City | 10270 |
| Cement, OK | Oklahoma | City | 464 |
| Center Township, OH | Ohio | City | 5970 |
| Center Township, PA | Pennsylvania | City | 11365 |
| Centerville, IA | Iowa | City | 5433 |
| Central Falls, RI | Rhode Island | City | 22464 |
| Central Point, OR | Oregon | City | 18648 |
| Centralia, WA | Washington | City | 18629 |
| Centre County, PA | Pennsylvania | County | 162264 |
| Ceres, CA | California | City | 49282 |
| Cerro Gordo County, IA | Iowa | County | 43006 |
| Chambers County, TX | Texas | County | 48865 |
| Champaign County, IL | Illinois | County | 2100006 |
| Champaign, IL | Illinois | City | 89114 |
| Chandler, AZ | Arizona | City | 279598 |
| Chardon Township, OH | Ohio | City | 4636 |
| Charleroi, PA | Pennsylvania | City | 4210 |
| Charles County, MD | Maryland | County | 168698 |
| Charleston, SC | South Carolina | City | 151612 |
| Charleston, WV | West Virginia | City | 48018 |
| Charlotte County, FL | Florida | County | 186847 |
| Charlotte, NC | North Carolina | City | 879809 |
| Charlottesville, VA | Virginia | City | 45672 |
| Chataignier, LA | Louisiana | City | 262 |
| Chatham County, GA | Georgia | County | 295291 |
| Chatham Township, NJ | New Jersey | City | 10284 |
| Chattanooga, TN | Tennessee | City | 181370 |
| Chautauqua County, NY | New York | County | 127657 |
| Chaves County, NM | New Mexico | County | 64629 |
| Cheektowaga, NY | New York | City | 89877 |
| Chehalis, WA | Washington | City | 7774 |
| Chelan County, WA | Washington | County | 79646 |
| Chelsea, MA | Massachusetts | City | 39878 |
| Cherokee County, AL | Alabama | County | 24996 |
| Cherokee County, KS | Kansas | County | 19130 |
| Cherokee County, SC | South Carolina | County | 56052 |
| Cherry Hill, NJ | New Jersey | City | 71009 |
| Chesapeake, VA | Virginia | City | 251269 |
| Chester County, PA | Pennsylvania | County | 538649 |
| Chester, PA | Pennsylvania | City | 32535 |
| Chesterfield County, VA | Virginia | County | 370688 |
| Chesterfield, MO | Missouri | City | 49703 |
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