| Heiloo to Oerlinghausen | 172.57 mi (277.73 km) |
| Heiloo to Oestrich-Winkel | 228.84 mi (368.28 km) |
| Heiloo to Offenburg | 318.53 mi (512.63 km) |
| Heiloo to Oftersheim | 279.36 mi (449.59 km) |
| Heiloo to Ohrdruf | 285.04 mi (458.73 km) |
| Heiloo to Ohringen | 313.92 mi (505.20 km) |
| Heiloo to Olbernhau | 392.63 mi (631.88 km) |
| Heiloo to Olching | 420.28 mi (676.38 km) |
| Heiloo to Oldenburg | 150.60 mi (242.36 km) |
| Heiloo to Oldenburg in Holstein | 279.48 mi (449.78 km) |
| Heiloo to Olfen | 128.44 mi (206.71 km) |
| Heiloo to Olpe | 172.29 mi (277.28 km) |
| Heiloo to Olsberg | 182.07 mi (293.01 km) |
| Heiloo to Oranienburg | 356.88 mi (574.34 km) |
| Heiloo to Ortenberg | 242.62 mi (390.46 km) |
