| Mannheim to Oestrich-Winkel | 41.05 mi (66.07 km) |
| Mannheim to Offenburg | 74.57 mi (120.01 km) |
| Mannheim to Oftersheim | 9.69 mi (15.60 km) |
| Mannheim to Ohrdruf | 136.53 mi (219.72 km) |
| Mannheim to Ohringen | 50.61 mi (81.45 km) |
| Mannheim to Olbernhau | 230.62 mi (371.15 km) |
| Mannheim to Olching | 157.20 mi (253.00 km) |
| Mannheim to Oldenburg | 252.85 mi (406.92 km) |
| Mannheim to Oldenburg in Holstein | 348.04 mi (560.12 km) |
| Mannheim to Olfen | 161.15 mi (259.35 km) |
| Mannheim to Olpe | 109.27 mi (175.86 km) |
| Mannheim to Olsberg | 128.67 mi (207.07 km) |
| Mannheim to Oranienburg | 306.05 mi (492.55 km) |
| Mannheim to Ortenberg | 65.45 mi (105.33 km) |
| Mannheim to Oschatz | 239.67 mi (385.71 km) |
