| Watford to Oakley (California) | 5,304.63 mi (8,536.98 km) |
| Watford to Oakton (Virginia) | 3,662.10 mi (5,893.57 km) |
| Watford to Oakville (Missouri) | 4,198.80 mi (6,757.32 km) |
| Watford to Oatfield (Oregon) | 4,901.77 mi (7,888.63 km) |
| Watford to Ocala (Florida) | 4,325.97 mi (6,961.98 km) |
| Watford to Ocean Acres (New Jersey) | 3,500.67 mi (5,633.79 km) |
| Watford to Ocean City (New Jersey) | 3,534.84 mi (5,688.77 km) |
| Watford to Ocean Pines (Maryland) | 3,596.74 mi (5,788.39 km) |
| Watford to Ocean Pointe (Hawaii) | 7,216.24 mi (11,613.41 km) |
| Watford to Ocean Springs (Mississippi) | 4,537.31 mi (7,302.09 km) |
| Watford to Oceanside (California) | 5,442.17 mi (8,758.32 km) |
| Watford to Oceanside (New York) | 3,435.46 mi (5,528.83 km) |
| Watford to Ocoee (Florida) | 4,330.05 mi (6,968.53 km) |
| Watford to Oconomowoc (Wisconsin) | 3,908.66 mi (6,290.38 km) |
| Watford to Odenton (Maryland) | 3,629.35 mi (5,840.88 km) |
