| Holtsville to Oakley (California) | 2,571.26 mi (4,138.04 km) |
| Holtsville to Oakton (Virginia) | 261.97 mi (421.60 km) |
| Holtsville to Oakville (Missouri) | 932.09 mi (1,500.05 km) |
| Holtsville to Oatfield (Oregon) | 2,479.52 mi (3,990.40 km) |
| Holtsville to Ocala (Florida) | 953.63 mi (1,534.72 km) |
| Holtsville to Ocean Acres (New Jersey) | 98.50 mi (158.52 km) |
| Holtsville to Ocean City (New Jersey) | 134.79 mi (216.93 km) |
| Holtsville to Ocean Pines (Maryland) | 201.66 mi (324.54 km) |
| Holtsville to Ocean Pointe (Hawaii) | 5,015.45 mi (8,071.59 km) |
| Holtsville to Ocean Springs (Mississippi) | 1,136.44 mi (1,828.92 km) |
| Holtsville to Oceanside (California) | 2,470.44 mi (3,975.79 km) |
| Holtsville to Oceanside (New York) | 33.38 mi (53.71 km) |
| Holtsville to Ocoee (Florida) | 971.91 mi (1,564.13 km) |
| Holtsville to Oconomowoc (Wisconsin) | 808.20 mi (1,300.66 km) |
| Holtsville to Odenton (Maryland) | 227.85 mi (366.68 km) |
