| Sligo to Odessa (Texas) | 4,609.50 mi (7,418.27 km) |
| Sligo to Ogden (Utah) | 4,447.52 mi (7,157.60 km) |
| Sligo to Oildale (California) | 4,997.48 mi (8,042.66 km) |
| Sligo to Ojus (Florida) | 4,051.86 mi (6,520.84 km) |
| Sligo to Okemos (Michigan) | 3,391.74 mi (5,458.48 km) |
| Sligo to Oklahoma City (Oklahoma) | 4,240.68 mi (6,824.71 km) |
| Sligo to Okmulgee (Oklahoma) | 4,176.59 mi (6,721.58 km) |
| Sligo to Olathe (Kansas) | 3,966.72 mi (6,383.82 km) |
| Sligo to Old Jamestown (Missouri) | 3,798.34 mi (6,112.84 km) |
| Sligo to Oldsmar (Florida) | 4,043.45 mi (6,507.31 km) |
| Sligo to Olean (New York) | 3,189.41 mi (5,132.85 km) |
| Sligo to Olive Branch (Mississippi) | 3,974.19 mi (6,395.85 km) |
| Sligo to Olivehurst (California) | 4,870.06 mi (7,837.60 km) |
| Sligo to Olney (Maryland) | 3,270.02 mi (5,262.58 km) |
| Sligo to Olympia (Washington) | 4,460.58 mi (7,178.60 km) |
