| Highgate to Oswego (Illinois) | 3,980.82 mi (6,406.51 km) |
| Highgate to Oswego (New York) | 3,442.16 mi (5,539.63 km) |
| Highgate to Otsego (Minnesota) | 4,007.10 mi (6,448.81 km) |
| Highgate to Ottawa (Illinois) | 4,014.77 mi (6,461.15 km) |
| Highgate to Ottawa (Kansas) | 4,390.97 mi (7,066.59 km) |
| Highgate to Ottumwa (Iowa) | 4,165.94 mi (6,704.43 km) |
| Highgate to Overland (Missouri) | 4,200.81 mi (6,760.56 km) |
| Highgate to Overland Park (Kansas) | 4,355.12 mi (7,008.89 km) |
| Highgate to Overlea (Maryland) | 3,620.84 mi (5,827.18 km) |
| Highgate to Oviedo (Florida) | 4,323.38 mi (6,957.81 km) |
| Highgate to Owasso (Oklahoma) | 4,528.62 mi (7,288.11 km) |
| Highgate to Owatonna (Minnesota) | 4,048.70 mi (6,515.75 km) |
| Highgate to Owensboro (Kentucky) | 4,119.78 mi (6,630.15 km) |
| Highgate to Owings Mills (Maryland) | 3,629.87 mi (5,841.70 km) |
| Highgate to Owosso (Michigan) | 3,761.73 mi (6,053.93 km) |
