| Forfar to Oswego (Illinois) | 3,729.73 mi (6,002.43 km) |
| Forfar to Oswego (New York) | 3,219.85 mi (5,181.84 km) |
| Forfar to Otsego (Minnesota) | 3,727.93 mi (5,999.52 km) |
| Forfar to Ottawa (Illinois) | 3,763.53 mi (6,056.81 km) |
| Forfar to Ottawa (Kansas) | 4,130.51 mi (6,647.42 km) |
| Forfar to Ottumwa (Iowa) | 3,905.35 mi (6,285.06 km) |
| Forfar to Overland (Missouri) | 3,955.13 mi (6,365.16 km) |
| Forfar to Overland Park (Kansas) | 4,095.41 mi (6,590.92 km) |
| Forfar to Overlea (Maryland) | 3,419.41 mi (5,503.01 km) |
| Forfar to Oviedo (Florida) | 4,152.77 mi (6,683.23 km) |
| Forfar to Owasso (Oklahoma) | 4,274.25 mi (6,878.74 km) |
| Forfar to Owatonna (Minnesota) | 3,774.72 mi (6,074.83 km) |
| Forfar to Owensboro (Kentucky) | 3,888.42 mi (6,257.80 km) |
| Forfar to Owings Mills (Maryland) | 3,427.20 mi (5,515.54 km) |
| Forfar to Owosso (Michigan) | 3,517.63 mi (5,661.08 km) |
