| Norwalk to Orbetello | 6,263.78 mi (10,080.58 km) |
| Norwalk to Oria | 6,573.19 mi (10,578.53 km) |
| Norwalk to Oristano | 6,307.00 mi (10,150.13 km) |
| Norwalk to Orta Nova | 6,467.58 mi (10,408.57 km) |
| Norwalk to Orte | 6,300.78 mi (10,140.12 km) |
| Norwalk to Ortona | 6,370.66 mi (10,252.58 km) |
| Norwalk to Orvieto | 6,278.10 mi (10,103.62 km) |
| Norwalk to Orzinuovi | 6,066.76 mi (9,763.51 km) |
| Norwalk to Osimo | 6,280.41 mi (10,107.35 km) |
| Norwalk to Ospitaletto | 6,063.08 mi (9,757.58 km) |
| Norwalk to Ostuni | 6,558.56 mi (10,554.98 km) |
| Norwalk to Ottaviano | 6,455.04 mi (10,388.38 km) |
| Norwalk to Ovada | 6,064.77 mi (9,760.30 km) |
| Norwalk to Ozieri | 6,286.33 mi (10,116.87 km) |
| Norwalk to Paceco | 6,546.07 mi (10,534.88 km) |
