| Cool Runnings Exeter | 13 | View |
| Coolquill A/C | 1 | View |
| Cooper | 0 | View |
| CooperVision Running Club | 16 | View |
| Copenhagen primary school | 2 | View |
| Copenhagen Water | 1 | View |
| Copplestone running club | 1 | View |
| Corby | 3 | View |
| Corby AC | 75 | View |
| Corby Athletic Club | 8 | View |
| Corby marvels | 1 | View |
| Corby Running Marvels | 5 | View |
| cordeliaoneill@gmail.com | 1 | View |
| Corden | 0 | View |
| COREtriathlon | 2 | View |
| corinna porteous | 1 | View |
| Corinne Cruickshank | 1 | View |
| Cork Masters/ Myrtleville Swimmers Cork Ireland | 3 | View |
| Cornelly Striders | 68 | View |
| Cornett | 0 | View |