| Elmhurst to Olympia Heights (Florida) | 1,198.43 mi (1,928.69 km) |
| Elmhurst to Omaha (Nebraska) | 421.27 mi (677.96 km) |
| Elmhurst to On Top of the World Designated Place (Florida) | 938.75 mi (1,510.78 km) |
| Elmhurst to Onalaska (Wisconsin) | 214.98 mi (345.97 km) |
| Elmhurst to Oneida (New York) | 630.44 mi (1,014.59 km) |
| Elmhurst to Oneonta (New York) | 659.82 mi (1,061.88 km) |
| Elmhurst to Ontario (California) | 1,694.54 mi (2,727.09 km) |
| Elmhurst to Ontario (Oregon) | 1,467.69 mi (2,362.02 km) |
| Elmhurst to Opa-locka (Florida) | 1,188.73 mi (1,913.07 km) |
| Elmhurst to Opelika (Alabama) | 653.47 mi (1,051.66 km) |
| Elmhurst to Opelousas (Louisiana) | 818.62 mi (1,317.44 km) |
| Elmhurst to Orange (California) | 1,713.03 mi (2,756.85 km) |
| Elmhurst to Orange (Texas) | 875.55 mi (1,409.06 km) |
| Elmhurst to Orange City (Florida) | 970.05 mi (1,561.15 km) |
| Elmhurst to Orangeburg (South Carolina) | 697.17 mi (1,121.99 km) |
