| Knightdale to Oerlinghausen | 4,212.12 mi (6,778.75 km) |
| Knightdale to Oestrich-Winkel | 4,237.02 mi (6,818.83 km) |
| Knightdale to Offenburg | 4,275.68 mi (6,881.04 km) |
| Knightdale to Oftersheim | 4,278.07 mi (6,884.89 km) |
| Knightdale to Ohrdruf | 4,324.86 mi (6,960.20 km) |
| Knightdale to Ohringen | 4,320.58 mi (6,953.31 km) |
| Knightdale to Olbernhau | 4,432.70 mi (7,133.74 km) |
| Knightdale to Olching | 4,424.75 mi (7,120.95 km) |
| Knightdale to Oldenburg | 4,164.46 mi (6,702.05 km) |
| Knightdale to Oldenburg in Holstein | 4,236.18 mi (6,817.47 km) |
| Knightdale to Olfen | 4,167.62 mi (6,707.14 km) |
| Knightdale to Olpe | 4,203.54 mi (6,764.94 km) |
| Knightdale to Olsberg | 4,220.93 mi (6,792.93 km) |
| Knightdale to Oranienburg | 4,367.47 mi (7,028.76 km) |
| Knightdale to Ortenberg | 4,270.47 mi (6,872.66 km) |
