| Hereford to Oswego (Illinois) | 3,867.76 mi (6,224.56 km) |
| Hereford to Oswego (New York) | 3,327.74 mi (5,355.48 km) |
| Hereford to Otsego (Minnesota) | 3,896.88 mi (6,271.43 km) |
| Hereford to Ottawa (Illinois) | 3,901.71 mi (6,279.20 km) |
| Hereford to Ottawa (Kansas) | 4,278.57 mi (6,885.69 km) |
| Hereford to Ottumwa (Iowa) | 4,053.61 mi (6,523.66 km) |
| Hereford to Overland (Missouri) | 4,087.34 mi (6,577.93 km) |
| Hereford to Overland Park (Kansas) | 4,242.66 mi (6,827.90 km) |
| Hereford to Overlea (Maryland) | 3,506.04 mi (5,642.42 km) |
| Hereford to Oviedo (Florida) | 4,209.12 mi (6,773.92 km) |
| Hereford to Owasso (Oklahoma) | 4,415.68 mi (7,106.35 km) |
| Hereford to Owatonna (Minnesota) | 3,937.81 mi (6,337.29 km) |
| Hereford to Owensboro (Kentucky) | 4,005.58 mi (6,446.35 km) |
| Hereford to Owings Mills (Maryland) | 3,515.07 mi (5,656.96 km) |
| Hereford to Owosso (Michigan) | 3,648.26 mi (5,871.30 km) |
