| Philadelphia to Noventa Vicentina | 4,199.49 mi (6,758.42 km) |
| Philadelphia to Novi di Modena | 4,185.40 mi (6,735.75 km) |
| Philadelphia to Novi Ligure | 4,098.40 mi (6,595.74 km) |
| Philadelphia to Nuoro | 4,271.24 mi (6,873.90 km) |
| Philadelphia to Occhiobello | 4,213.62 mi (6,781.16 km) |
| Philadelphia to Oderzo | 4,223.49 mi (6,797.04 km) |
| Philadelphia to Oggiono | 4,090.01 mi (6,582.24 km) |
| Philadelphia to Olbia | 4,258.07 mi (6,852.70 km) |
| Philadelphia to Oleggio | 4,065.07 mi (6,542.10 km) |
| Philadelphia to Olgiate Comasco | 4,073.60 mi (6,555.83 km) |
| Philadelphia to Olgiate Olona | 4,074.77 mi (6,557.71 km) |
| Philadelphia to Omegna | 4,046.62 mi (6,512.41 km) |
| Philadelphia to Opera | 4,097.05 mi (6,593.57 km) |
| Philadelphia to Oppeano | 4,184.01 mi (6,733.52 km) |
| Philadelphia to Orbassano | 4,036.21 mi (6,495.66 km) |
