| Champaign to Oak Harbor (Washington) | 1,775.99 mi (2,858.19 km) |
| Champaign to Oak Hills (Oregon) | 1,776.81 mi (2,859.50 km) |
| Champaign to Oak Lawn (Illinois) | 113.82 mi (183.18 km) |
| Champaign to Oak Park (California) | 1,719.42 mi (2,767.14 km) |
| Champaign to Oak Park (Illinois) | 125.07 mi (201.28 km) |
| Champaign to Oak Park (Michigan) | 310.15 mi (499.13 km) |
| Champaign to Oak Ridge (Florida) | 893.78 mi (1,438.41 km) |
| Champaign to Oak Ridge (New Jersey) | 725.03 mi (1,166.83 km) |
| Champaign to Oak Ridge (Tennessee) | 359.26 mi (578.18 km) |
| Champaign to Oakdale (California) | 1,748.29 mi (2,813.60 km) |
| Champaign to Oakdale (Minnesota) | 412.60 mi (664.02 km) |
| Champaign to Oakland (California) | 1,819.79 mi (2,928.66 km) |
| Champaign to Oakland (New Jersey) | 738.39 mi (1,188.33 km) |
| Champaign to Oakland Park (Florida) | 1,070.18 mi (1,722.29 km) |
| Champaign to Oakleaf Plantation (Florida) | 776.98 mi (1,250.43 km) |
