sort by Rank | Alpha
| Possible Meanings | Rank |
| Center for Nonlinear Optical Materials | * |
| Center of Nonlinear Optical Materials | * |
| Costs Not Otherwise Matchable | * |
| Cahill Number One Mine | * |
| Camp Number One Mine | * |
| Cape Number One Mine | * |
| Capital Number One Mine | * |
| Carbon Number One Mine | * |
| Carlinville Number One Mine | * |
| Carterville Number One Mine | * |
| Catlin Number One Mine | * |
| Central Number One Mine | * |
| Centralia Number One Mine | * |
| Century Number One Mine | * |
| Cessna Number One Mine | * |
| Chamness Number One Mine | * |
| Chapman Number One Mine | * |
| Chenoa Number One Mine | * |
| Chicago Number One Mine | * |
| Christopher Number One Mine | * |
| Christy Number One Mine | * |
| Citizens Number One Mine | * |
| Clark Number One Mine | * |
| Clarkson Number One Mine | * |
| Colbert Number One Mine | * |
| Conorth Number One Mine | * |
| Consol Number One Mine | * |
| Consumers Number One Mine | * |
| Cooksey Number One Mine | * |
| Cooperative Number One Mine | * |
| Cosmic Number One Mine | * |
| Costein Number One Mine | * |
| Coulterville Number One Mine | * |
| Crenshaw Number One Mine | * |
| Crescent Number One Mine | * |
| Crown Number One Mine | * |
| Cruitt Number One Mine | * |
| Cruser Number One Mine | * |
| Crystal Number One Mine | * |