| Westchester to Olympia (Washington) | 2,738.36 mi (4,406.97 km) |
| Westchester to Olympia Heights (Florida) | 1.80 mi (2.90 km) |
| Westchester to Omaha (Nebraska) | 1,397.95 mi (2,249.78 km) |
| Westchester to On Top of the World Designated Place (Florida) | 260.61 mi (419.41 km) |
| Westchester to Onalaska (Wisconsin) | 1,393.58 mi (2,242.75 km) |
| Westchester to Oneida (New York) | 1,226.31 mi (1,973.56 km) |
| Westchester to Oneonta (New York) | 1,192.71 mi (1,919.48 km) |
| Westchester to Ontario (California) | 2,290.37 mi (3,685.99 km) |
| Westchester to Ontario (Oregon) | 2,400.77 mi (3,863.67 km) |
| Westchester to Opa-locka (Florida) | 12.15 mi (19.56 km) |
| Westchester to Opelika (Alabama) | 565.52 mi (910.12 km) |
| Westchester to Opelousas (Louisiana) | 786.62 mi (1,265.93 km) |
| Westchester to Orange (California) | 2,301.53 mi (3,703.95 km) |
| Westchester to Orange (Texas) | 871.80 mi (1,403.03 km) |
| Westchester to Orange City (Florida) | 227.61 mi (366.30 km) |
