| Hartford to Noventa Vicentina | 4,024.74 mi (6,477.19 km) |
| Hartford to Novi di Modena | 4,010.94 mi (6,454.99 km) |
| Hartford to Novi Ligure | 3,924.42 mi (6,315.74 km) |
| Hartford to Nuoro | 4,099.94 mi (6,598.22 km) |
| Hartford to Occhiobello | 4,039.02 mi (6,500.17 km) |
| Hartford to Oderzo | 4,048.38 mi (6,515.24 km) |
| Hartford to Oggiono | 3,915.41 mi (6,301.24 km) |
| Hartford to Olbia | 4,086.29 mi (6,576.24 km) |
| Hartford to Oleggio | 3,890.69 mi (6,261.45 km) |
| Hartford to Olgiate Comasco | 3,899.07 mi (6,274.94 km) |
| Hartford to Olgiate Olona | 3,900.32 mi (6,276.96 km) |
| Hartford to Omegna | 3,872.14 mi (6,231.60 km) |
| Hartford to Opera | 3,922.66 mi (6,312.92 km) |
| Hartford to Oppeano | 4,009.32 mi (6,452.37 km) |
| Hartford to Orbassano | 3,862.35 mi (6,215.85 km) |
