| Piqua to Butzbach | 4,270.62 mi (6,872.90 km) |
| Piqua to Buxtehude | 4,205.35 mi (6,767.85 km) |
| Piqua to Cadolzburg | 4,389.73 mi (7,064.58 km) |
| Piqua to Calbe | 4,335.13 mi (6,976.73 km) |
| Piqua to Calw | 4,333.51 mi (6,974.12 km) |
| Piqua to Castrop-Rauxel | 4,181.94 mi (6,730.18 km) |
| Piqua to Celle | 4,248.11 mi (6,836.67 km) |
| Piqua to Cham | 4,466.20 mi (7,187.66 km) |
| Piqua to Chemnitz | 4,415.93 mi (7,106.74 km) |
| Piqua to Clausthal-Zellerfeld | 4,285.82 mi (6,897.36 km) |
| Piqua to Cloppenburg | 4,166.30 mi (6,705.01 km) |
| Piqua to Coburg | 4,363.96 mi (7,023.11 km) |
| Piqua to Coesfeld | 4,163.12 mi (6,699.89 km) |
| Piqua to Cologne | 4,188.48 mi (6,740.70 km) |
| Piqua to Coswig | 4,429.22 mi (7,128.15 km) |
