| Clay | 20,000 | West Point | Mississippi | Tupelo-Meridian-Greenwood, MS | View → |
| Clay | 11,000 | Henrietta | Texas | Wichita Falls, TX | View → |
| Clay | 8,000 | Clay Center | Kansas | Wichita, KS | View → |
| Clayton | 300,000 | Jonesboro | Georgia | Atlanta, GA | View → |
| Clayton | 18,000 | Elkader | Iowa | Cedar Rapids, IA | View → |
| Clear Creek | 9,500 | Georgetown | Colorado | Denver-Colorado Springs, CO | View → |
| Clearfield | 79,000 | Clearfield | Pennsylvania | Johnstown-Altoona-State College, PA | View → |
| Clearwater | 9,000 | Bagley | Minnesota | Fargo, ND | View → |
| Clearwater | 8,800 | Orofino | Idaho | Spokane, WA | View → |
| Cleburne | 15,100 | Heflin | Alabama | Atlanta, GA | View → |
| Cleburne | 24,000 | Heber Springs | Arkansas | Little Rock, AR | View → |
| Clermont | 210,000 | Batavia | Ohio | Cincinnati-Dayton, OH | View → |
| Cleveland | 98,000 | Shelby | North Carolina | Charlotte-Greensboro, NC | View → |
| Cleveland | 8,000 | Rison | Arkansas | Little Rock, AR | View → |
| Cleveland | 295,000 | Norman | Oklahoma | Oklahoma City, OK | View → |
| Clinch | 7,000 | Homerville | Georgia | Jacksonville-Tallahassee, FL | View → |
| Clinton | 79,000 | Plattsburgh | New York | Burlington, VT | View → |
| Clinton | 41,000 | Wilmington | Ohio | Cincinnati-Dayton, OH | View → |
| Clinton | 46,000 | Clinton | Iowa | Davenport, IA-Moline, IL | View → |
| Clinton | 80,000 | St. Johns | Michigan | Grand Rapids, MI | View → |
| Clinton | 34,000 | Frankfort | Indiana | Indianapolis-Fort Wayne, IN | View → |
| Clinton | 22,500 | Plattsburg | Missouri | Kansas City, MO | View → |
| Clinton | 10,000 | Albany | Kentucky | Nashville, TN | View → |
| Clinton | 38,000 | Lock Haven | Pennsylvania | Scranton, PA-Binghamton, NY | View → |
| Clinton | 37,000 | Carlyle | Illinois | St. Louis, MO | View → |
| Cloud | 9,500 | Concordia | Kansas | Wichita, KS | View → |
| Coahoma | 22,000 | Clarksdale | Mississippi | Memphis, TN | View → |
| Coal | 5,400 | Coalgate | Oklahoma | Sherman, TX | View → |
| Cobb | 800,000 | Marietta | Georgia | Atlanta, GA | View → |
| Cochran | 3,100 | Morton | Texas | Lubbock-Abilene, TX | View → |
| Cocke | 36,000 | Newport | Tennessee | Knoxville-Chattanooga, TN | View → |
| Coconino | 155,000 | Flagstaff | Arizona | Phoenix-Tuscon, AZ | View → |
| Codington | 28,800 | Watertown | South Dakota | Sioux Falls-Rapid City, SD | View → |
| Coffee | 43,000 | Douglas | Georgia | Jacksonville-Tallahassee, FL | View → |
| Coffee | 53,500 | Enterprise | Alabama | Montgomery-Dothan, AL | View → |
| Coffee | 58,000 | Tullahoma | Tennessee | Nashville, TN | View → |
| Coffey | 8,500 | Burlington | Kansas | Wichita, KS | View → |
| Coke | 3,500 | Robert Lee | Texas | Lubbock-Abilene, TX | View → |
| Colbert | 57,200 | Muscle Shoals | Alabama | Birmingham-Huntsville, AL | View → |
| Cole | 76,500 | Jefferson City | Missouri | Springfield, MO | View → |
| Coleman | 7,700 | Coleman | Texas | Lubbock-Abilene, TX | View → |
| Coles | 51,000 | Charleston | Illinois | Champaign-Peoria, IL | View → |
| Colfax | 12,000 | Raton | New Mexico | Albuquerque, NM | View → |
| Colfax | 10,700 | Schuyler | Nebraska | Omaha, NE-Sioux City, IA | View → |
| Colleton | 38,000 | Walterboro | South Carolina | Charleston-Florence, SC | View → |
| Collier | 413,300 | Naples | Florida | Miami-West Palm Beach, FL | View → |
| Collin | 1,200,000 | McKinney | Texas | Dallas-Fort Worth, TX | View → |
| Collingsworth | 3,200 | Wellington | Texas | Amarillo, TX | View → |
| Colonial Heights City | 18,000 | Colonial Heights | Virginia | Richmond, VA | View → |
| Colorado | 22,000 | Columbus | Texas | Houston, TX | View → |
