| Kirkwood to Olympia Heights (Florida) | 1,064.52 mi (1,713.18 km) |
| Kirkwood to Omaha (Nebraska) | 351.27 mi (565.32 km) |
| Kirkwood to On Top of the World Designated Place (Florida) | 803.11 mi (1,292.48 km) |
| Kirkwood to Onalaska (Wisconsin) | 369.12 mi (594.04 km) |
| Kirkwood to Oneida (New York) | 830.37 mi (1,336.35 km) |
| Kirkwood to Oneonta (New York) | 848.34 mi (1,365.27 km) |
| Kirkwood to Ontario (California) | 1,539.85 mi (2,478.15 km) |
| Kirkwood to Ontario (Oregon) | 1,421.93 mi (2,288.38 km) |
| Kirkwood to Opa-locka (Florida) | 1,056.85 mi (1,700.83 km) |
| Kirkwood to Opelika (Alabama) | 497.21 mi (800.17 km) |
| Kirkwood to Opelousas (Louisiana) | 564.39 mi (908.30 km) |
| Kirkwood to Orange (California) | 1,557.00 mi (2,505.75 km) |
| Kirkwood to Orange (Texas) | 614.42 mi (988.82 km) |
| Kirkwood to Orange City (Florida) | 847.05 mi (1,363.20 km) |
| Kirkwood to Orangeburg (South Carolina) | 638.49 mi (1,027.56 km) |
