| Most to Oswego (Illinois) | 4,525.95 mi (7,283.81 km) |
| Most to Oswego (New York) | 4,008.92 mi (6,451.73 km) |
| Most to Otsego (Minnesota) | 4,522.65 mi (7,278.50 km) |
| Most to Ottawa (Illinois) | 4,559.77 mi (7,338.24 km) |
| Most to Ottawa (Kansas) | 4,927.23 mi (7,929.61 km) |
| Most to Ottumwa (Iowa) | 4,702.07 mi (7,567.25 km) |
| Most to Overland (Missouri) | 4,750.75 mi (7,645.60 km) |
| Most to Overland Park (Kansas) | 4,892.12 mi (7,873.11 km) |
| Most to Overlea (Maryland) | 4,199.79 mi (6,758.90 km) |
| Most to Oviedo (Florida) | 4,915.79 mi (7,911.21 km) |
| Most to Owasso (Oklahoma) | 5,070.84 mi (8,160.73 km) |
| Most to Owatonna (Minnesota) | 4,570.42 mi (7,355.38 km) |
| Most to Owensboro (Kentucky) | 4,680.96 mi (7,533.28 km) |
| Most to Owings Mills (Maryland) | 4,208.19 mi (6,772.43 km) |
| Most to Owosso (Michigan) | 4,312.80 mi (6,940.77 km) |
