| Westerville to Olympia (Washington) | 2,033.41 mi (3,272.47 km) |
| Westerville to Olympia Heights (Florida) | 1,006.02 mi (1,619.04 km) |
| Westerville to Omaha (Nebraska) | 691.75 mi (1,113.27 km) |
| Westerville to On Top of the World Designated Place (Florida) | 762.14 mi (1,226.54 km) |
| Westerville to Onalaska (Wisconsin) | 498.27 mi (801.89 km) |
| Westerville to Oneida (New York) | 426.72 mi (686.75 km) |
| Westerville to Oneonta (New York) | 438.20 mi (705.22 km) |
| Westerville to Ontario (California) | 1,944.58 mi (3,129.50 km) |
| Westerville to Ontario (Oregon) | 1,754.45 mi (2,823.52 km) |
| Westerville to Opa-locka (Florida) | 994.73 mi (1,600.87 km) |
| Westerville to Opelika (Alabama) | 533.36 mi (858.35 km) |
| Westerville to Opelousas (Louisiana) | 839.51 mi (1,351.06 km) |
| Westerville to Orange (California) | 1,962.29 mi (3,157.99 km) |
| Westerville to Orange (Texas) | 921.98 mi (1,483.78 km) |
| Westerville to Orange City (Florida) | 778.63 mi (1,253.08 km) |
