| Duncan to Cosham | 4,685.70 mi (7,540.91 km) |
| Duncan to Costessey | 4,711.83 mi (7,582.96 km) |
| Duncan to Cottingham | 4,615.86 mi (7,428.51 km) |
| Duncan to Coulsdon | 4,705.56 mi (7,572.87 km) |
| Duncan to Coventry | 4,618.78 mi (7,433.21 km) |
| Duncan to Cowdenbeath | 4,440.95 mi (7,147.01 km) |
| Duncan to Cowes | 4,679.35 mi (7,530.68 km) |
| Duncan to Cowley | 4,685.80 mi (7,541.06 km) |
| Duncan to Cowley | 4,651.35 mi (7,485.62 km) |
| Duncan to Cramlington | 4,533.50 mi (7,295.96 km) |
| Duncan to Cranleigh | 4,698.68 mi (7,561.79 km) |
| Duncan to Crawley | 4,710.68 mi (7,581.11 km) |
| Duncan to Crayford | 4,713.46 mi (7,585.58 km) |
| Duncan to Crewe | 4,562.64 mi (7,342.86 km) |
| Duncan to Crigglestone | 4,579.77 mi (7,370.43 km) |
