| Grays to Oswego (Illinois) | 4,001.97 mi (6,440.55 km) |
| Grays to Oswego (New York) | 3,463.57 mi (5,574.07 km) |
| Grays to Otsego (Minnesota) | 4,027.73 mi (6,482.01 km) |
| Grays to Ottawa (Illinois) | 4,035.92 mi (6,495.19 km) |
| Grays to Ottawa (Kansas) | 4,412.01 mi (7,100.44 km) |
| Grays to Ottumwa (Iowa) | 4,186.96 mi (6,738.26 km) |
| Grays to Overland (Missouri) | 4,222.04 mi (6,794.72 km) |
| Grays to Overland Park (Kansas) | 4,376.16 mi (7,042.75 km) |
| Grays to Overlea (Maryland) | 3,642.31 mi (5,861.73 km) |
| Grays to Oviedo (Florida) | 4,344.76 mi (6,992.21 km) |
| Grays to Owasso (Oklahoma) | 4,549.75 mi (7,322.12 km) |
| Grays to Owatonna (Minnesota) | 4,069.45 mi (6,549.15 km) |
| Grays to Owensboro (Kentucky) | 4,141.14 mi (6,664.53 km) |
| Grays to Owings Mills (Maryland) | 3,651.34 mi (5,876.26 km) |
| Grays to Owosso (Michigan) | 3,782.96 mi (6,088.09 km) |
