| Fond du Lac to Oerlinghausen | 4,191.85 mi (6,746.12 km) |
| Fond du Lac to Oestrich-Winkel | 4,245.98 mi (6,833.25 km) |
| Fond du Lac to Offenburg | 4,305.12 mi (6,928.43 km) |
| Fond du Lac to Oftersheim | 4,292.52 mi (6,908.15 km) |
| Fond du Lac to Ohrdruf | 4,310.05 mi (6,936.35 km) |
| Fond du Lac to Ohringen | 4,332.79 mi (6,972.96 km) |
| Fond du Lac to Olbernhau | 4,407.32 mi (7,092.90 km) |
| Fond du Lac to Olching | 4,440.54 mi (7,146.36 km) |
| Fond du Lac to Oldenburg | 4,130.29 mi (6,647.05 km) |
| Fond du Lac to Oldenburg in Holstein | 4,175.13 mi (6,719.22 km) |
| Fond du Lac to Olfen | 4,156.40 mi (6,689.08 km) |
| Fond du Lac to Olpe | 4,199.73 mi (6,758.82 km) |
| Fond du Lac to Olsberg | 4,209.72 mi (6,774.88 km) |
| Fond du Lac to Oranienburg | 4,316.11 mi (6,946.11 km) |
| Fond du Lac to Ortenberg | 4,269.76 mi (6,871.52 km) |
