| Grantsville to Oswego (Illinois) | 1,254.02 mi (2,018.15 km) |
| Grantsville to Oswego (New York) | 1,842.27 mi (2,964.85 km) |
| Grantsville to Otsego (Minnesota) | 1,003.71 mi (1,615.32 km) |
| Grantsville to Ottawa (Illinois) | 1,230.83 mi (1,980.84 km) |
| Grantsville to Ottawa (Kansas) | 925.32 mi (1,489.16 km) |
| Grantsville to Ottumwa (Iowa) | 1,046.95 mi (1,684.90 km) |
| Grantsville to Overland (Missouri) | 1,180.37 mi (1,899.62 km) |
| Grantsville to Overland Park (Kansas) | 950.91 mi (1,530.35 km) |
| Grantsville to Overlea (Maryland) | 1,892.29 mi (3,045.35 km) |
| Grantsville to Oviedo (Florida) | 1,947.50 mi (3,134.20 km) |
| Grantsville to Owasso (Oklahoma) | 947.30 mi (1,524.54 km) |
| Grantsville to Owatonna (Minnesota) | 1,009.10 mi (1,624.00 km) |
| Grantsville to Owensboro (Kentucky) | 1,367.58 mi (2,200.91 km) |
| Grantsville to Owings Mills (Maryland) | 1,877.31 mi (3,021.24 km) |
| Grantsville to Owosso (Michigan) | 1,459.90 mi (2,349.49 km) |
