| Site | State | Type | Population |
|---|---|---|---|
| Cook County, IL | Illinois | County | 5170000 |
| Cooke County, TX | Texas | County | 42224 |
| Cookeville, TN | Tennessee | City | 35138 |
| Coon Rapids, MN | Minnesota | City | 63385 |
| Copiague, NY | New York | City | 23561 |
| Copley Township, OH | Ohio | City | 17305 |
| Copperas Cove, TX | Texas | City | 37715 |
| Coral Gables, FL | Florida | City | 49248 |
| Coralville, IA | Iowa | City | 22949 |
| Coram, NY | New York | City | 40630 |
| Corbin, KY | Kentucky | City | 7768 |
| Cordova, AL | Alabama | City | 1655 |
| Corona, CA | California | City | 159743 |
| Corpus Christi, TX | Texas | City | 317883 |
| Corte Madera, CA | California | City | 10177 |
| Cortland, OH | Ohio | City | 7105 |
| Corunna, MI | Michigan | City | 3063 |
| Corvallis, OR | Oregon | City | 58612 |
| Coryell County, TX | Texas | County | 84232 |
| Costa Mesa, CA | California | City | 110750 |
| Cottage Grove, MN | Minnesota | City | 39926 |
| Council Bluffs, IA | Iowa | City | 62355 |
| Coventry Township, OH | Ohio | City | 10915 |
| Coventry, RI | Rhode Island | City | 35014 |
| Covington, GA | Georgia | City | 14192 |
| Covington, KY | Kentucky | City | 40961 |
| Coweta County, GA | Georgia | County | 149956 |
| Cowlitz County, WA | Washington | County | 116116 |
| Craig, AK | Alaska | City | 1206 |
| Cranberry Township, PA | Pennsylvania | City | 33096 |
| Cranston, RI | Rhode Island | City | 82566 |
| Craven County, NC | North Carolina | County | 100720 |
| Crawford County, IN | Indiana | County | 10514 |
| Crawford County, PA | Pennsylvania | County | 85063 |
| Crockett, TX | Texas | City | 6447 |
| Crow Wing County, MN | Minnesota | County | 67270 |
| Crystal Lake, IL | Illinois | City | 40411 |
| Cudahy, CA | California | City | 22294 |
| Cumberland County, ME | Maine | County | 294520 |
| Cumberland County, NC | North Carolina | County | 335508 |
| Cumberland County, PA | Pennsylvania | County | 259469 |
| Cumberland, MD | Maryland | City | 18746 |
| Cumberland, ME | Maine | City | 7211 |
| Cuyahoga County, OH | Ohio | County | 1235000 |
| Cuyahoga Falls, OH | Ohio | City | 50810 |
| Cypress, CA | California | City | 49926 |
| Cypress, TX | Texas | City | 182459 |
| Dakota County, MN | Minnesota | County | 442038 |
| Dale County, AL | Alabama | County | 49342 |
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