| Highgate to Odessa (Texas) | 5,003.03 mi (8,051.60 km) |
| Highgate to Ogden (Utah) | 4,834.42 mi (7,780.25 km) |
| Highgate to Oildale (California) | 5,382.93 mi (8,662.99 km) |
| Highgate to Ojus (Florida) | 4,415.82 mi (7,106.58 km) |
| Highgate to Okemos (Michigan) | 3,783.91 mi (6,089.61 km) |
| Highgate to Oklahoma City (Oklahoma) | 4,633.99 mi (7,457.68 km) |
| Highgate to Okmulgee (Oklahoma) | 4,569.55 mi (7,353.97 km) |
| Highgate to Olathe (Kansas) | 4,360.28 mi (7,017.19 km) |
| Highgate to Old Jamestown (Missouri) | 4,190.66 mi (6,744.22 km) |
| Highgate to Oldsmar (Florida) | 4,415.91 mi (7,106.71 km) |
| Highgate to Olean (New York) | 3,577.75 mi (5,757.82 km) |
| Highgate to Olive Branch (Mississippi) | 4,363.75 mi (7,022.77 km) |
| Highgate to Olivehurst (California) | 5,249.21 mi (8,447.79 km) |
| Highgate to Olney (Maryland) | 3,653.15 mi (5,879.18 km) |
| Highgate to Olympia (Washington) | 4,827.42 mi (7,768.99 km) |
