| Holyoke to Oerlinghausen | 3,679.96 mi (5,922.33 km) |
| Holyoke to Oestrich-Winkel | 3,709.83 mi (5,970.39 km) |
| Holyoke to Offenburg | 3,752.57 mi (6,039.18 km) |
| Holyoke to Oftersheim | 3,752.04 mi (6,038.32 km) |
| Holyoke to Ohrdruf | 3,793.91 mi (6,105.71 km) |
| Holyoke to Ohringen | 3,794.29 mi (6,106.31 km) |
| Holyoke to Olbernhau | 3,900.44 mi (6,277.15 km) |
| Holyoke to Olching | 3,899.50 mi (6,275.64 km) |
| Holyoke to Oldenburg | 3,630.15 mi (5,842.17 km) |
| Holyoke to Oldenburg in Holstein | 3,698.73 mi (5,952.53 km) |
| Holyoke to Olfen | 3,636.73 mi (5,852.76 km) |
| Holyoke to Olpe | 3,673.99 mi (5,912.72 km) |
| Holyoke to Olsberg | 3,690.22 mi (5,938.83 km) |
| Holyoke to Oranienburg | 3,831.48 mi (6,166.16 km) |
| Holyoke to Ortenberg | 3,741.68 mi (6,021.65 km) |
