| Sligo to Oswego (Illinois) | 3,587.86 mi (5,774.10 km) |
| Sligo to Oswego (New York) | 3,053.57 mi (4,914.24 km) |
| Sligo to Otsego (Minnesota) | 3,613.74 mi (5,815.75 km) |
| Sligo to Ottawa (Illinois) | 3,621.81 mi (5,828.73 km) |
| Sligo to Ottawa (Kansas) | 3,997.41 mi (6,433.20 km) |
| Sligo to Ottumwa (Iowa) | 3,772.34 mi (6,070.99 km) |
| Sligo to Overland (Missouri) | 3,808.54 mi (6,129.25 km) |
| Sligo to Overland Park (Kansas) | 3,961.59 mi (6,375.56 km) |
| Sligo to Overlea (Maryland) | 3,237.96 mi (5,210.99 km) |
| Sligo to Oviedo (Florida) | 3,952.37 mi (6,360.72 km) |
| Sligo to Owasso (Oklahoma) | 4,135.50 mi (6,655.45 km) |
| Sligo to Owatonna (Minnesota) | 3,655.03 mi (5,882.20 km) |
| Sligo to Owensboro (Kentucky) | 3,729.77 mi (6,002.49 km) |
| Sligo to Owings Mills (Maryland) | 3,246.62 mi (5,224.92 km) |
| Sligo to Owosso (Michigan) | 3,369.49 mi (5,422.66 km) |
