| Westerville to Oskaloosa (Iowa) | 515.13 mi (829.03 km) |
| Westerville to Oswego (Illinois) | 302.60 mi (486.98 km) |
| Westerville to Oswego (New York) | 402.63 mi (647.97 km) |
| Westerville to Otsego (Minnesota) | 648.32 mi (1,043.36 km) |
| Westerville to Ottawa (Illinois) | 320.56 mi (515.88 km) |
| Westerville to Ottawa (Kansas) | 667.14 mi (1,073.65 km) |
| Westerville to Ottumwa (Iowa) | 502.03 mi (807.94 km) |
| Westerville to Overland (Missouri) | 409.50 mi (659.03 km) |
| Westerville to Overland Park (Kansas) | 632.56 mi (1,018.01 km) |
| Westerville to Overlea (Maryland) | 344.14 mi (553.84 km) |
| Westerville to Oviedo (Florida) | 798.32 mi (1,284.78 km) |
| Westerville to Owasso (Oklahoma) | 748.49 mi (1,204.58 km) |
| Westerville to Owatonna (Minnesota) | 594.74 mi (957.14 km) |
| Westerville to Owensboro (Kentucky) | 278.50 mi (448.20 km) |
| Westerville to Owings Mills (Maryland) | 329.17 mi (529.75 km) |
