| Colquitt | 47,000 | Moultrie | Georgia | Jacksonville-Tallahassee, FL | View → |
| Columbia | 61,000 | Hudson | New York | Albany-Utica-Elmira, NY | View → |
| Columbia | 73,300 | Lake City | Florida | Jacksonville-Tallahassee, FL | View → |
| Columbia | 57,000 | Portage | Wisconsin | Madison-La Crosse, WI | View → |
| Columbia | 52,000 | St. Helens | Oregon | Portland, OR | View → |
| Columbia | 160,000 | Evans | Georgia | Savannah-Augusta, GA | View → |
| Columbia | 64,000 | Bloomsburg | Pennsylvania | Scranton, PA-Binghamton, NY | View → |
| Columbia | 23,000 | Magnolia | Arkansas | Shreveport, LA | View → |
| Columbia | 4,000 | Dayton | Washington | Spokane, WA | View → |
| Columbiana | 101,000 | Salem | Ohio | Cleveland-Youngstown, OH | View → |
| Columbus | 53,000 | Whiteville | North Carolina | Raleigh-Greenville-Wilmington, NC | View → |
| Colusa | 22,000 | Colusa | California | Sacramento, CA | View → |
| Comal | 184,000 | New Braunfels | Texas | San Antonio-Corpus Christi, TX | View → |
| Comanche | 13,500 | Comanche | Texas | Dallas-Fort Worth, TX | View → |
| Comanche | 115,000 | Lawton | Oklahoma | Wichita Falls, TX | View → |
| Comanche | 1,700 | Coldwater | Kansas | Wichita, KS | View → |
| Concho | 4,000 | Eden | Texas | Austin-Waco, TX | View → |
| Concordia | 20,000 | Vidalia | Louisiana | Jackson, MS | View → |
| Conecuh | 11,600 | Evergreen | Alabama | Mobile, AL-Panama City, FL | View → |
| Conejos | 8,000 | Conejos | Colorado | Denver-Colorado Springs, CO | View → |
| Contra Costa | 1,150,000 | Concord | California | San Francisco, CA | View → |
| Converse | 14,000 | Douglas | Wyoming | Casper, WY | View → |
| Conway | 20,000 | Morrilton | Arkansas | Little Rock, AR | View → |
| Cook | 5,100,000 | Chicago | Illinois | Chicago, IL | View → |
| Cook | 5,500 | Grand Marais | Minnesota | Green Bay, WI-Duluth, MN | View → |
| Cook | 17,000 | Adel | Georgia | Jacksonville-Tallahassee, FL | View → |
| Cooke | 43,000 | Gainesville | Texas | Dallas-Fort Worth, TX | View → |
| Cooper | 17,500 | Boonville | Missouri | Kansas City, MO | View → |
| Coos | 64,000 | Coos Bay | Oregon | Medford, OR | View → |
| Coos | 31,000 | Berlin | New Hampshire | Portland-Bangor, ME | View → |
| Coosa | 10,400 | Rockford | Alabama | Montgomery-Dothan, AL | View → |
| Copiah | 29,000 | Hazlehurst | Mississippi | Jackson, MS | View → |
| Corson | 4,200 | McIntosh | South Dakota | Bismarck, ND | View → |
| Cortland | 47,000 | Cortland | New York | Buffalo-Rochester-Syracuse, NY | View → |
| Coryell | 78,000 | Gatesville | Texas | Austin-Waco, TX | View → |
| Coshocton | 36,500 | Coshocton | Ohio | Columbus, OH | View → |
| Costilla | 4,000 | San Luis | Colorado | Albuquerque, NM | View → |
| Cottle | 1,400 | Paducah | Texas | Amarillo, TX | View → |
| Cotton | 5,500 | Walters | Oklahoma | Wichita Falls, TX | View → |
| Cottonwood | 11,000 | Windom | Minnesota | Minneapolis-St. Paul, MN | View → |
| Covington | 19,000 | Collins | Mississippi | Jackson, MS | View → |
| Covington | 37,600 | Andalusia | Alabama | Montgomery-Dothan, AL | View → |
| Covington City | 5,400 | Covington | Virginia | Roanoke-Harrisonburg, VA | View → |
| Coweta | 155,000 | Newnan | Georgia | Atlanta, GA | View → |
| Cowley | 35,500 | Winfield | Kansas | Wichita, KS | View → |
| Cowlitz | 112,000 | Longview | Washington | Portland, OR | View → |
| Craig | 5,000 | New Castle | Virginia | Roanoke-Harrisonburg, VA | View → |
| Craig | 14,500 | Vinita | Oklahoma | Tulsa, OK-Fort Smith, AR | View → |
| Craighead | 113,000 | Jonesboro | Arkansas | Memphis, TN | View → |
| Crane | 4,600 | Crane | Texas | El Paso-Odessa, TX | View → |
