| Martha Lake to Oerlinghausen | 4,957.21 mi (7,977.85 km) |
| Martha Lake to Oestrich-Winkel | 5,056.53 mi (8,137.71 km) |
| Martha Lake to Offenburg | 5,144.52 mi (8,279.30 km) |
| Martha Lake to Oftersheim | 5,107.26 mi (8,219.34 km) |
| Martha Lake to Ohrdruf | 5,070.84 mi (8,160.74 km) |
| Martha Lake to Ohringen | 5,138.93 mi (8,270.30 km) |
| Martha Lake to Olbernhau | 5,137.37 mi (8,267.80 km) |
| Martha Lake to Olching | 5,240.64 mi (8,434.00 km) |
| Martha Lake to Oldenburg | 4,878.40 mi (7,851.03 km) |
| Martha Lake to Oldenburg in Holstein | 4,868.62 mi (7,835.29 km) |
| Martha Lake to Olfen | 4,942.18 mi (7,953.68 km) |
| Martha Lake to Olpe | 4,993.35 mi (8,036.02 km) |
| Martha Lake to Olsberg | 4,989.03 mi (8,029.06 km) |
| Martha Lake to Oranienburg | 5,009.66 mi (8,062.26 km) |
| Martha Lake to Ortenberg | 5,060.49 mi (8,144.08 km) |
