| Slupca to Oswego (Illinois) | 4,594.80 mi (7,394.61 km) |
| Slupca to Oswego (New York) | 4,098.11 mi (6,595.27 km) |
| Slupca to Otsego (Minnesota) | 4,570.19 mi (7,355.01 km) |
| Slupca to Ottawa (Illinois) | 4,628.38 mi (7,448.66 km) |
| Slupca to Ottawa (Kansas) | 4,987.75 mi (8,027.01 km) |
| Slupca to Ottumwa (Iowa) | 4,763.35 mi (7,665.87 km) |
| Slupca to Overland (Missouri) | 4,822.63 mi (7,761.27 km) |
| Slupca to Overland Park (Kansas) | 4,953.34 mi (7,971.63 km) |
| Slupca to Overlea (Maryland) | 4,300.72 mi (6,921.34 km) |
| Slupca to Oviedo (Florida) | 5,032.88 mi (8,099.63 km) |
| Slupca to Owasso (Oklahoma) | 5,135.42 mi (8,264.65 km) |
| Slupca to Owatonna (Minnesota) | 4,621.93 mi (7,438.28 km) |
| Slupca to Owensboro (Kentucky) | 4,762.72 mi (7,664.86 km) |
| Slupca to Owings Mills (Maryland) | 4,308.42 mi (6,933.73 km) |
| Slupca to Owosso (Michigan) | 4,387.20 mi (7,060.52 km) |
