| Fort Dodge to Olympia Heights (Florida) | 1,399.95 mi (2,253.00 km) |
| Fort Dodge to Omaha (Nebraska) | 129.43 mi (208.30 km) |
| Fort Dodge to On Top of the World Designated Place (Florida) | 1,138.30 mi (1,831.92 km) |
| Fort Dodge to Onalaska (Wisconsin) | 177.22 mi (285.21 km) |
| Fort Dodge to Oneida (New York) | 937.54 mi (1,508.82 km) |
| Fort Dodge to Oneonta (New York) | 971.62 mi (1,563.66 km) |
| Fort Dodge to Ontario (California) | 1,393.09 mi (2,241.96 km) |
| Fort Dodge to Ontario (Oregon) | 1,148.21 mi (1,847.87 km) |
| Fort Dodge to Opa-locka (Florida) | 1,392.18 mi (2,240.50 km) |
| Fort Dodge to Opelika (Alabama) | 832.67 mi (1,340.05 km) |
| Fort Dodge to Opelousas (Louisiana) | 836.10 mi (1,345.57 km) |
| Fort Dodge to Orange (California) | 1,412.17 mi (2,272.68 km) |
| Fort Dodge to Orange (Texas) | 856.18 mi (1,377.89 km) |
| Fort Dodge to Orange City (Florida) | 1,181.22 mi (1,900.99 km) |
| Fort Dodge to Orangeburg (South Carolina) | 953.50 mi (1,534.51 km) |
