| Site | State | Type | Population |
|---|---|---|---|
| Cabarrus County, NC | North Carolina | County | 231278 |
| Caddo Parish, LA | Louisiana | County | 243243 |
| Cadillac, MI | Michigan | City | 10367 |
| Calcasieu Parish, LA | Louisiana | County | 202858 |
| Calcium, NY | New York | City | 3597 |
| Caldwell, ID | Idaho | City | 56734 |
| Caledonia County, VT | Vermont | County | 30224 |
| Calhoun County, AL | Alabama | County | 116441 |
| Calhoun County, MI | Michigan | County | 133943 |
| Calumet City, IL | Illinois | City | 35159 |
| Calvert County, MD | Maryland | County | 88737 |
| Camarillo, CA | California | City | 68583 |
| Cambria County, PA | Pennsylvania | County | 131611 |
| Cambridge, MA | Massachusetts | City | 108780 |
| Cambridge, MD | Maryland | City | 12004 |
| Cambridge, OH | Ohio | City | 10014 |
| Camden County, NJ | New Jersey | County | 523771 |
| Camden, NJ | New Jersey | City | 74002 |
| Cameron County, TX | Texas | County | 423163 |
| Cameron, TX | Texas | City | 5352 |
| Camp Verde, AZ | Arizona | City | 12244 |
| Campbell, CA | California | City | 42754 |
| Canaan, NH | New Hampshire | City | 3901 |
| Canal Winchester, OH | Ohio | City | 8818 |
| Canandaigua, NY | New York | City | 10526 |
| Canby, OR | Oregon | City | 17860 |
| Canfield Township, OH | Ohio | City | 15530 |
| Canon City, CO | Colorado | City | 17363 |
| Canton Township, MI | Michigan | City | 93018 |
| Canton, GA | Georgia | City | 29459 |
| Canton, OH | Ohio | City | 70426 |
| Canton, PA | Pennsylvania | City | 1892 |
| Canyon, TX | Texas | City | 15648 |
| Cape Canaveral, FL | Florida | City | 9970 |
| Cape Coral, FL | Florida | City | 204510 |
| Carbon Hill, AL | Alabama | City | 1727 |
| Carlisle, PA | Pennsylvania | City | 20406 |
| Carlsbad, CA | California | City | 113592 |
| Carolina Beach, NC | North Carolina | City | 6000 |
| Carroll County, MD | Maryland | County | 172981 |
| Carson City, NV | Nevada | City | 55244 |
| Cartersville, GA | Georgia | City | 19731 |
| Cary, NC | North Carolina | City | 176987 |
| Cascade County, MT | Montana | County | 81576 |
| Caseyville, IL | Illinois | City | 4203 |
| Casper, WY | Wyoming | City | 58656 |
| Cass County, ND | North Dakota | County | 179937 |
| Casselberry, FL | Florida | City | 29093 |
| Castaic, CA | California | City | 18479 |
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