| Pittsburgh to Noventa Vicentina | 4,384.68 mi (7,056.46 km) |
| Pittsburgh to Novi di Modena | 4,372.57 mi (7,036.97 km) |
| Pittsburgh to Novi Ligure | 4,288.55 mi (6,901.75 km) |
| Pittsburgh to Nuoro | 4,473.33 mi (7,199.12 km) |
| Pittsburgh to Occhiobello | 4,399.85 mi (7,080.87 km) |
| Pittsburgh to Oderzo | 4,405.95 mi (7,090.70 km) |
| Pittsburgh to Oggiono | 4,276.34 mi (6,882.10 km) |
| Pittsburgh to Olbia | 4,458.34 mi (7,175.01 km) |
| Pittsburgh to Oleggio | 4,252.83 mi (6,844.26 km) |
| Pittsburgh to Olgiate Comasco | 4,260.39 mi (6,856.43 km) |
| Pittsburgh to Olgiate Olona | 4,262.12 mi (6,859.22 km) |
| Pittsburgh to Omegna | 4,233.77 mi (6,813.60 km) |
| Pittsburgh to Opera | 4,284.78 mi (6,895.68 km) |
| Pittsburgh to Oppeano | 4,369.59 mi (7,032.18 km) |
| Pittsburgh to Orbassano | 4,227.08 mi (6,802.83 km) |
