| Halstenbek to Oswego (Illinois) | 4,270.06 mi (6,871.99 km) |
| Halstenbek to Oswego (New York) | 3,762.72 mi (6,055.51 km) |
| Halstenbek to Otsego (Minnesota) | 4,259.37 mi (6,854.80 km) |
| Halstenbek to Ottawa (Illinois) | 4,303.79 mi (6,926.28 km) |
| Halstenbek to Ottawa (Kansas) | 4,668.26 mi (7,512.83 km) |
| Halstenbek to Ottumwa (Iowa) | 4,443.29 mi (7,150.78 km) |
| Halstenbek to Overland (Missouri) | 4,496.24 mi (7,236.00 km) |
| Halstenbek to Overland Park (Kansas) | 4,633.39 mi (7,456.72 km) |
| Halstenbek to Overlea (Maryland) | 3,960.80 mi (6,374.29 km) |
| Halstenbek to Oviedo (Florida) | 4,688.66 mi (7,545.66 km) |
| Halstenbek to Owasso (Oklahoma) | 4,813.44 mi (7,746.48 km) |
| Halstenbek to Owatonna (Minnesota) | 4,308.32 mi (6,933.57 km) |
| Halstenbek to Owensboro (Kentucky) | 4,431.07 mi (7,131.12 km) |
| Halstenbek to Owings Mills (Maryland) | 3,968.75 mi (6,387.08 km) |
| Halstenbek to Owosso (Michigan) | 4,059.23 mi (6,532.70 km) |
