| Fairmount to Oswego (Illinois) | 623.69 mi (1,003.73 km) |
| Fairmount to Oswego (New York) | 31.05 mi (49.97 km) |
| Fairmount to Otsego (Minnesota) | 872.98 mi (1,404.92 km) |
| Fairmount to Ottawa (Illinois) | 653.59 mi (1,051.86 km) |
| Fairmount to Ottawa (Kansas) | 1,037.89 mi (1,670.32 km) |
| Fairmount to Ottumwa (Iowa) | 840.19 mi (1,352.15 km) |
| Fairmount to Overland (Missouri) | 795.24 mi (1,279.81 km) |
| Fairmount to Overland Park (Kansas) | 1,001.54 mi (1,611.82 km) |
| Fairmount to Overlea (Maryland) | 254.45 mi (409.50 km) |
| Fairmount to Oviedo (Florida) | 1,031.06 mi (1,659.33 km) |
| Fairmount to Owasso (Oklahoma) | 1,137.72 mi (1,830.98 km) |
| Fairmount to Owatonna (Minnesota) | 851.78 mi (1,370.80 km) |
| Fairmount to Owensboro (Kentucky) | 677.63 mi (1,090.55 km) |
| Fairmount to Owings Mills (Maryland) | 252.38 mi (406.17 km) |
| Fairmount to Owosso (Michigan) | 400.33 mi (644.27 km) |
