| Hilliard to Oswego (Illinois) | 293.57 mi (472.46 km) |
| Hilliard to Oswego (New York) | 416.33 mi (670.01 km) |
| Hilliard to Otsego (Minnesota) | 642.05 mi (1,033.29 km) |
| Hilliard to Ottawa (Illinois) | 310.56 mi (499.80 km) |
| Hilliard to Ottawa (Kansas) | 654.13 mi (1,052.72 km) |
| Hilliard to Ottumwa (Iowa) | 490.84 mi (789.94 km) |
| Hilliard to Overland (Missouri) | 396.02 mi (637.33 km) |
| Hilliard to Overland Park (Kansas) | 619.66 mi (997.25 km) |
| Hilliard to Overlea (Maryland) | 355.95 mi (572.84 km) |
| Hilliard to Oviedo (Florida) | 794.03 mi (1,277.87 km) |
| Hilliard to Owasso (Oklahoma) | 734.74 mi (1,182.45 km) |
| Hilliard to Owatonna (Minnesota) | 587.23 mi (945.05 km) |
| Hilliard to Owensboro (Kentucky) | 264.72 mi (426.02 km) |
| Hilliard to Owings Mills (Maryland) | 340.99 mi (548.77 km) |
| Hilliard to Owosso (Michigan) | 211.20 mi (339.89 km) |
