| Fort Madison to Oak Harbor (Washington) | 1,618.06 mi (2,604.01 km) |
| Fort Madison to Oak Hills (Oregon) | 1,614.13 mi (2,597.69 km) |
| Fort Madison to Oak Lawn (Illinois) | 201.79 mi (324.76 km) |
| Fort Madison to Oak Park (California) | 1,561.85 mi (2,513.55 km) |
| Fort Madison to Oak Park (Illinois) | 204.60 mi (329.28 km) |
| Fort Madison to Oak Park (Michigan) | 441.01 mi (709.74 km) |
| Fort Madison to Oak Ridge (Florida) | 1,010.42 mi (1,626.11 km) |
| Fort Madison to Oak Ridge (New Jersey) | 880.25 mi (1,416.62 km) |
| Fort Madison to Oak Ridge (Tennessee) | 499.68 mi (804.16 km) |
| Fort Madison to Oakdale (California) | 1,584.31 mi (2,549.70 km) |
| Fort Madison to Oakdale (Minnesota) | 312.59 mi (503.07 km) |
| Fort Madison to Oakland (California) | 1,655.50 mi (2,664.27 km) |
| Fort Madison to Oakland (New Jersey) | 893.58 mi (1,438.08 km) |
| Fort Madison to Oakland Park (Florida) | 1,186.39 mi (1,909.31 km) |
| Fort Madison to Oakleaf Plantation (Florida) | 898.12 mi (1,445.38 km) |
