| Boulder to Chojnice | 5,124.95 mi (8,247.80 km) |
| Boulder to Chojnow | 5,203.49 mi (8,374.20 km) |
| Boulder to Chorzow | 5,340.87 mi (8,595.30 km) |
| Boulder to Choszczno | 5,092.53 mi (8,195.64 km) |
| Boulder to Chrzanow | 5,362.52 mi (8,630.15 km) |
| Boulder to Ciechanow | 5,251.81 mi (8,451.97 km) |
| Boulder to Ciechocinek | 5,200.96 mi (8,370.13 km) |
| Boulder to Cieszyn | 5,360.60 mi (8,627.06 km) |
| Boulder to Czarna Bialostocka | 5,297.52 mi (8,525.53 km) |
| Boulder to Czarnkow | 5,138.56 mi (8,269.72 km) |
| Boulder to Czechowice-Dziedzice | 5,362.83 mi (8,630.65 km) |
| Boulder to Czeladz | 5,342.93 mi (8,598.62 km) |
| Boulder to Czersk Pomorski | 5,131.73 mi (8,258.72 km) |
| Boulder to Czestochowa | 5,319.33 mi (8,560.64 km) |
| Boulder to Czluchow | 5,121.63 mi (8,242.47 km) |
