| Opelika to Collegno | 4,796.38 mi (7,719.03 km) |
| Opelika to Cologno al Serio | 4,873.08 mi (7,842.47 km) |
| Opelika to Cologno Monzese | 4,856.64 mi (7,816.00 km) |
| Opelika to Colorno | 4,923.30 mi (7,923.28 km) |
| Opelika to Comacchio | 5,008.58 mi (8,060.53 km) |
| Opelika to Comiso | 5,389.56 mi (8,673.65 km) |
| Opelika to Como | 4,839.57 mi (7,788.53 km) |
| Opelika to Concordia Sagittaria | 5,001.23 mi (8,048.70 km) |
| Opelika to Concorezzo | 4,857.21 mi (7,816.92 km) |
| Opelika to Conegliano | 4,973.92 mi (8,004.76 km) |
| Opelika to Conselice | 4,999.62 mi (8,046.11 km) |
| Opelika to Conselve | 4,977.28 mi (8,010.16 km) |
| Opelika to Conversano | 5,355.30 mi (8,618.52 km) |
| Opelika to Copertino | 5,422.69 mi (8,726.98 km) |
| Opelika to Copparo | 4,986.89 mi (8,025.62 km) |
