| Willebroek to Oakley (California) | 5,472.51 mi (8,807.15 km) |
| Willebroek to Oakton (Virginia) | 3,869.01 mi (6,226.58 km) |
| Willebroek to Oakville (Missouri) | 4,399.46 mi (7,080.25 km) |
| Willebroek to Oatfield (Oregon) | 5,058.83 mi (8,141.40 km) |
| Willebroek to Ocala (Florida) | 4,534.89 mi (7,298.19 km) |
| Willebroek to Ocean Acres (New Jersey) | 3,708.16 mi (5,967.71 km) |
| Willebroek to Ocean City (New Jersey) | 3,742.45 mi (6,022.90 km) |
| Willebroek to Ocean Pines (Maryland) | 3,804.58 mi (6,122.88 km) |
| Willebroek to Ocean Pointe (Hawaii) | 7,322.36 mi (11,784.20 km) |
| Willebroek to Ocean Springs (Mississippi) | 4,743.86 mi (7,634.51 km) |
| Willebroek to Oceanside (California) | 5,621.62 mi (9,047.12 km) |
| Willebroek to Oceanside (New York) | 3,642.70 mi (5,862.37 km) |
| Willebroek to Ocoee (Florida) | 4,539.16 mi (7,305.07 km) |
| Willebroek to Oconomowoc (Wisconsin) | 4,106.20 mi (6,608.30 km) |
| Willebroek to Odenton (Maryland) | 3,836.39 mi (6,174.08 km) |
