| Champaign to Odessa (Texas) | 968.78 mi (1,559.10 km) |
| Champaign to Ogden (Utah) | 1,240.24 mi (1,995.97 km) |
| Champaign to Oildale (California) | 1,701.85 mi (2,738.86 km) |
| Champaign to Ojus (Florida) | 1,084.01 mi (1,744.55 km) |
| Champaign to Okemos (Michigan) | 268.41 mi (431.97 km) |
| Champaign to Oklahoma City (Oklahoma) | 597.50 mi (961.58 km) |
| Champaign to Okmulgee (Oklahoma) | 523.72 mi (842.84 km) |
| Champaign to Olathe (Kansas) | 359.13 mi (577.97 km) |
| Champaign to Old Jamestown (Missouri) | 138.78 mi (223.34 km) |
| Champaign to Oldsmar (Florida) | 892.56 mi (1,436.43 km) |
| Champaign to Olean (New York) | 529.82 mi (852.65 km) |
| Champaign to Olive Branch (Mississippi) | 366.32 mi (589.53 km) |
| Champaign to Olivehurst (California) | 1,763.04 mi (2,837.34 km) |
| Champaign to Olney (Maryland) | 599.45 mi (964.71 km) |
| Champaign to Olympia (Washington) | 1,781.77 mi (2,867.48 km) |
