| Pottstown to Oerlinghausen | 3,886.63 mi (6,254.93 km) |
| Pottstown to Oestrich-Winkel | 3,916.40 mi (6,302.83 km) |
| Pottstown to Offenburg | 3,958.85 mi (6,371.15 km) |
| Pottstown to Oftersheim | 3,958.54 mi (6,370.66 km) |
| Pottstown to Ohrdruf | 4,000.59 mi (6,438.33 km) |
| Pottstown to Ohringen | 4,000.81 mi (6,438.68 km) |
| Pottstown to Olbernhau | 4,107.10 mi (6,609.75 km) |
| Pottstown to Olching | 4,105.96 mi (6,607.91 km) |
| Pottstown to Oldenburg | 3,836.74 mi (6,174.63 km) |
| Pottstown to Oldenburg in Holstein | 3,904.95 mi (6,284.41 km) |
| Pottstown to Olfen | 3,843.41 mi (6,185.37 km) |
| Pottstown to Olpe | 3,880.65 mi (6,245.31 km) |
| Pottstown to Olsberg | 3,896.90 mi (6,271.45 km) |
| Pottstown to Oranienburg | 4,037.90 mi (6,498.37 km) |
| Pottstown to Ortenberg | 3,948.32 mi (6,354.20 km) |
