| Birkenhead to Oakley (California) | 5,141.89 mi (8,275.07 km) |
| Birkenhead to Oakton (Virginia) | 3,521.98 mi (5,668.08 km) |
| Birkenhead to Oakville (Missouri) | 4,048.45 mi (6,515.34 km) |
| Birkenhead to Oatfield (Oregon) | 4,739.05 mi (7,626.77 km) |
| Birkenhead to Ocala (Florida) | 4,193.52 mi (6,748.82 km) |
| Birkenhead to Ocean Acres (New Jersey) | 3,362.25 mi (5,411.02 km) |
| Birkenhead to Ocean City (New Jersey) | 3,396.81 mi (5,466.63 km) |
| Birkenhead to Ocean Pines (Maryland) | 3,459.47 mi (5,567.47 km) |
| Birkenhead to Ocean Pointe (Hawaii) | 7,063.09 mi (11,366.95 km) |
| Birkenhead to Ocean Springs (Mississippi) | 4,396.12 mi (7,074.87 km) |
| Birkenhead to Oceanside (California) | 5,280.90 mi (8,498.79 km) |
| Birkenhead to Oceanside (New York) | 3,296.32 mi (5,304.91 km) |
| Birkenhead to Ocoee (Florida) | 4,199.12 mi (6,757.83 km) |
| Birkenhead to Oconomowoc (Wisconsin) | 3,755.39 mi (6,043.71 km) |
| Birkenhead to Odenton (Maryland) | 3,489.58 mi (5,615.93 km) |
