| Fort Collins to Noventa Vicentina | 5,329.89 mi (8,577.63 km) |
| Fort Collins to Novi di Modena | 5,327.60 mi (8,573.94 km) |
| Fort Collins to Novi Ligure | 5,260.71 mi (8,466.30 km) |
| Fort Collins to Nuoro | 5,496.78 mi (8,846.22 km) |
| Fort Collins to Occhiobello | 5,349.45 mi (8,609.11 km) |
| Fort Collins to Oderzo | 5,337.35 mi (8,589.64 km) |
| Fort Collins to Oggiono | 5,230.86 mi (8,418.25 km) |
| Fort Collins to Olbia | 5,473.48 mi (8,808.71 km) |
| Fort Collins to Oleggio | 5,214.91 mi (8,392.59 km) |
| Fort Collins to Olgiate Comasco | 5,217.64 mi (8,396.99 km) |
| Fort Collins to Olgiate Olona | 5,221.98 mi (8,403.97 km) |
| Fort Collins to Omegna | 5,193.72 mi (8,358.48 km) |
| Fort Collins to Opera | 5,245.60 mi (8,441.98 km) |
| Fort Collins to Oppeano | 5,317.18 mi (8,557.18 km) |
| Fort Collins to Orbassano | 5,204.78 mi (8,376.29 km) |
