| Birkenhead to Orangevale (California) | 5,087.61 mi (8,187.71 km) |
| Birkenhead to Orchards (Washington) | 4,721.49 mi (7,598.50 km) |
| Birkenhead to Orcutt (California) | 5,284.55 mi (8,504.66 km) |
| Birkenhead to Oregon (Ohio) | 3,632.79 mi (5,846.41 km) |
| Birkenhead to Oregon (Wisconsin) | 3,796.58 mi (6,110.01 km) |
| Birkenhead to Oregon City (Oregon) | 4,743.07 mi (7,633.23 km) |
| Birkenhead to Orem (Utah) | 4,703.16 mi (7,569.00 km) |
| Birkenhead to Orinda (California) | 5,162.67 mi (8,308.52 km) |
| Birkenhead to Orland Park (Illinois) | 3,802.52 mi (6,119.57 km) |
| Birkenhead to Orlando (Florida) | 4,196.40 mi (6,753.45 km) |
| Birkenhead to Ormond Beach (Florida) | 4,144.79 mi (6,670.39 km) |
| Birkenhead to Oro Valley (Arizona) | 5,114.96 mi (8,231.73 km) |
| Birkenhead to Oroville (California) | 5,050.73 mi (8,128.37 km) |
| Birkenhead to Oshkosh (Wisconsin) | 3,714.56 mi (5,978.01 km) |
| Birkenhead to Oskaloosa (Iowa) | 3,994.64 mi (6,428.75 km) |
