1850 Atlas
| Name | What | Place | Pop | Other |
| Coman's Well | PO | Sussex Co, VA | ||
| Commack | PV | Smithtown twp, Suffolk Co, Long Island, NY | ||
| Commerce | PT | Oakland Co, MI | 1,428 | |
| Commerce | V | Wilson Co, TN | ||
| Commerce | PV | Tunica Co, MS | water by Mississippi river | |
| Commerce | PV | Scott Co, MO | water by Mississippi river | |
| Commettsburg | PO | Washington Co, PA | ||
| Como | PO | Whiteside Co, IL | ||
| Como | PO | Henry Co, TN | ||
| Como | PO | DeSoto Co, MS | ||
| Competine | PO | Wapello Co, IA | ||
| Comstock | PV | Kalamazoo Co, MI | water by Kalamazoo river | |
| Comstock's Landing | PO | Fort Ann twp, Washington Co, NY | ||
| Conchardee | PO | Talladega Co, AL | ||
| Concord | City | Merrimac Co, NH | 8,576 | seat of justice, State Capital |
| Concord | PT | Somerset Co, ME | 554 | water by Kennebec river |
| Concord | PT | Essex Co, VT | 1,153 | water by Connecticut & Passumpsie rivers |
| Concord | PT, CH | Middlesex Co, MS | 2,249 | seat of justice together with Cambridge & Lowell, water by Concord river |
| Concord | T | Erie Co, NY | 3,242 | water by Cattaraugus creek |
| Concord | T | Delaware Co, PA | 1,049 | water by Painter's creek |
| Concord | PV | Sussex Co, DE | water by Broad creek | |
| Concord | PV | Franklin Co, PA | 882 | water by Tuscarora creek |
| Concord | PT | Lake Co, OH | 1,031 | |
| Concord | T | Erie Co, PA | water by tributaries of Broken Straw & French creeks | |
| Concord | PT | Appomattox Co, VA | ||
| Concord | PV, CH | Cabarrus Co, NC | seat of justice, water by Big Cold Water creek | |
| Concord | PV | Tippecanoe Co, IN | ||
| Concord | PV | Baker Co, GA | ||
| Concord | PV | Lewis Co, KY | water by Ohio river | |
| Concord | PT | Jackson Co, MI | 893 | water by Kalamazoo river |
| Concord | V | Lincoln Co, TN | ||
| Concord | PV | Callaway Co, MO | ||
| Concord | T | Washington Co, MO | 815 | |
| Concord | T | Green Co, AR | ||
| Concord | T | Ross Co, OH | 2,672 | water by Paint creek |
| Concord | T | Champaign Co, OH | 1,010 | |
| Concord | T | Delaware Co, OH | 1,369 | |
| Concord | T | Fayette Co, OH | 836 | |
| Concord | T | Highland Co, OH | 1,500 | |
| Concord | T | Miami Co, OH | 1,353 | |
| Concord | PO | Morgan Co, IL | ||
| Concord | PO | Jefferson Co, WI | ||
| Concord | PO | Louisa Co, IA | ||
| Concord | PO | Harrison Co, TX | ||
| Concordia | PV | Fayette Co, TN | ||
| Concordia | PO | Bolivar Co, MS | ||
| Concordia | PO | Harrison twp, Drake Co, OH | ||
| Concordville | PT | Delaware Co, PA | 1,049 | |
| Conemaugh | T | Cambria Co, PA | 3,027 | water by Stone creek, Little Conemaugh & Conemaugh rivers |
| Conemaugh | T | Indiana Co, PA | 1,748 | water by Black-legs creek & Conemagh river |
| Conemaugh | PT | Somerset Co, PA | 1,434 | |
| Conerly's | PO | Pike Co, MS | ||
| Conestoga | PT | Lancaster Co, PA | 2,723 | |
| Conequenessing | T | Butler Co, PA | water by Conequenessing, Break Neck & Yellow creeks | |
| Conesus | PT | Livingston Co, NY | 1,418 | |
| Conesville | PT | Schoharie Co, NY | 1,582 | water by Manor Kill |
| Conewago | T | York Co, PA | 1,270 | |
| Conewago | T | Adams Co, PA | 569 | |
| Conewango | PT | Cattaraugus Co, NY | 1,408 | water by Conewango & Little Conewango creeks |
| Conewingo | V | Cecil Co, MD | water by Conewingo Creek | |
| Congress | PT | Wayne Co, OH | 2,336 | water by Killibuck creek |
| Congress | T | Richland Co, OH | water by tributaries of Whetstone river | |
| Conhocton | T | Steuben Co, NY | 1,993 | water by Conhocton creek |
| Conine | PO | Licking Co, OH | ||
| Conklin | PT | Broome Co, NY | 2,232 | water by Susquehanna river |
| Conklin Centre | PO | Conklin twp, Broome Co, NY |