| Gardner to Oswego (Illinois) | 400.01 mi (643.75 km) |
| Gardner to Oswego (New York) | 1,008.59 mi (1,623.17 km) |
| Gardner to Otsego (Minnesota) | 450.91 mi (725.68 km) |
| Gardner to Ottawa (Illinois) | 367.18 mi (590.91 km) |
| Gardner to Ottawa (Kansas) | 23.33 mi (37.54 km) |
| Gardner to Ottumwa (Iowa) | 202.31 mi (325.58 km) |
| Gardner to Overland (Missouri) | 245.73 mi (395.46 km) |
| Gardner to Overland Park (Kansas) | 13.94 mi (22.43 km) |
| Gardner to Overlea (Maryland) | 986.33 mi (1,587.35 km) |
| Gardner to Oviedo (Florida) | 1,053.94 mi (1,696.15 km) |
| Gardner to Owasso (Oklahoma) | 181.30 mi (291.78 km) |
| Gardner to Owatonna (Minnesota) | 375.15 mi (603.74 km) |
| Gardner to Owensboro (Kentucky) | 429.67 mi (691.48 km) |
| Gardner to Owings Mills (Maryland) | 971.54 mi (1,563.54 km) |
| Gardner to Owosso (Michigan) | 630.81 mi (1,015.20 km) |
