| Pittsburgh to Opwijk | 3,900.48 mi (6,277.22 km) |
| Pittsburgh to Ostend | 3,843.12 mi (6,184.91 km) |
| Pittsburgh to Oud-Heverlee | 3,923.47 mi (6,314.21 km) |
| Pittsburgh to Oud-Turnhout | 3,921.79 mi (6,311.51 km) |
| Pittsburgh to Oudenaarde | 3,880.72 mi (6,245.41 km) |
| Pittsburgh to Oudenburg | 3,847.50 mi (6,191.96 km) |
| Pittsburgh to Oupeye | 3,965.71 mi (6,382.20 km) |
| Pittsburgh to Overijse | 3,919.65 mi (6,308.07 km) |
| Pittsburgh to Overpelt | 3,941.69 mi (6,343.53 km) |
| Pittsburgh to Paal | 3,937.36 mi (6,336.57 km) |
| Pittsburgh to Peer | 3,945.61 mi (6,349.85 km) |
| Pittsburgh to Pepinster | 3,976.82 mi (6,400.07 km) |
| Pittsburgh to Peruwelz | 3,889.61 mi (6,259.73 km) |
| Pittsburgh to Perwez | 3,935.49 mi (6,333.55 km) |
| Pittsburgh to Philippeville | 3,937.48 mi (6,336.76 km) |
