| Hoyo de Manzanares to Oswego (Illinois) | 4,200.95 mi (6,760.77 km) |
| Hoyo de Manzanares to Oswego (New York) | 3,608.92 mi (5,807.99 km) |
| Hoyo de Manzanares to Otsego (Minnesota) | 4,303.51 mi (6,925.84 km) |
| Hoyo de Manzanares to Ottawa (Illinois) | 4,234.21 mi (6,814.30 km) |
| Hoyo de Manzanares to Ottawa (Kansas) | 4,623.84 mi (7,441.35 km) |
| Hoyo de Manzanares to Ottumwa (Iowa) | 4,405.80 mi (7,090.45 km) |
| Hoyo de Manzanares to Overland (Missouri) | 4,399.59 mi (7,080.46 km) |
| Hoyo de Manzanares to Overland Park (Kansas) | 4,586.98 mi (7,382.03 km) |
| Hoyo de Manzanares to Overlea (Maryland) | 3,729.25 mi (6,001.64 km) |
| Hoyo de Manzanares to Oviedo (Florida) | 4,332.07 mi (6,971.79 km) |
| Hoyo de Manzanares to Owasso (Oklahoma) | 4,740.87 mi (7,629.69 km) |
| Hoyo de Manzanares to Owatonna (Minnesota) | 4,329.16 mi (6,967.11 km) |
| Hoyo de Manzanares to Owensboro (Kentucky) | 4,283.92 mi (6,894.30 km) |
| Hoyo de Manzanares to Owings Mills (Maryland) | 3,740.88 mi (6,020.36 km) |
| Hoyo de Manzanares to Owosso (Michigan) | 3,971.07 mi (6,390.82 km) |
