| Niederkassel to Ottendorf-Okrilla | 296.33 mi (476.90 km) |
| Niederkassel to Ottersberg | 181.67 mi (292.37 km) |
| Niederkassel to Ottobrunn | 281.74 mi (453.42 km) |
| Niederkassel to Ottweiler | 100.36 mi (161.51 km) |
| Niederkassel to Overath | 14.83 mi (23.87 km) |
| Niederkassel to Oyten | 176.60 mi (284.21 km) |
| Niederkassel to Paderborn | 97.02 mi (156.14 km) |
| Niederkassel to Papenburg | 156.24 mi (251.45 km) |
| Niederkassel to Parchim | 271.45 mi (436.86 km) |
| Niederkassel to Pasewalk | 348.44 mi (560.77 km) |
| Niederkassel to Passau | 326.37 mi (525.24 km) |
| Niederkassel to Pattensen | 154.36 mi (248.42 km) |
| Niederkassel to Pegnitz | 212.18 mi (341.47 km) |
| Niederkassel to Peine | 172.26 mi (277.23 km) |
| Niederkassel to Peissenberg | 276.50 mi (444.99 km) |
