| Sluis to Oswego (Illinois) | 4,122.62 mi (6,634.72 km) |
| Sluis to Oswego (New York) | 3,588.71 mi (5,775.47 km) |
| Sluis to Otsego (Minnesota) | 4,141.94 mi (6,665.80 km) |
| Sluis to Ottawa (Illinois) | 4,156.56 mi (6,689.34 km) |
| Sluis to Ottawa (Kansas) | 4,530.92 mi (7,291.82 km) |
| Sluis to Ottumwa (Iowa) | 4,305.75 mi (6,929.43 km) |
| Sluis to Overland (Missouri) | 4,343.83 mi (6,990.71 km) |
| Sluis to Overland Park (Kansas) | 4,495.23 mi (7,234.37 km) |
| Sluis to Overlea (Maryland) | 3,770.12 mi (6,067.43 km) |
| Sluis to Oviedo (Florida) | 4,475.40 mi (7,202.47 km) |
| Sluis to Owasso (Oklahoma) | 4,670.01 mi (7,515.66 km) |
| Sluis to Owatonna (Minnesota) | 4,185.03 mi (6,735.16 km) |
| Sluis to Owensboro (Kentucky) | 4,265.31 mi (6,864.35 km) |
| Sluis to Owings Mills (Maryland) | 3,779.02 mi (6,081.74 km) |
| Sluis to Owosso (Michigan) | 3,904.81 mi (6,284.19 km) |
