| Enniskillen to Odessa (Texas) | 4,638.72 mi (7,465.30 km) |
| Enniskillen to Ogden (Utah) | 4,471.88 mi (7,196.79 km) |
| Enniskillen to Oildale (California) | 5,021.38 mi (8,081.13 km) |
| Enniskillen to Ojus (Florida) | 4,085.68 mi (6,575.27 km) |
| Enniskillen to Okemos (Michigan) | 3,421.99 mi (5,507.16 km) |
| Enniskillen to Oklahoma City (Oklahoma) | 4,270.16 mi (6,872.16 km) |
| Enniskillen to Okmulgee (Oklahoma) | 4,206.36 mi (6,769.49 km) |
| Enniskillen to Olathe (Kansas) | 3,995.94 mi (6,430.84 km) |
| Enniskillen to Old Jamestown (Missouri) | 3,828.50 mi (6,161.37 km) |
| Enniskillen to Oldsmar (Florida) | 4,076.80 mi (6,560.97 km) |
| Enniskillen to Olean (New York) | 3,220.87 mi (5,183.49 km) |
| Enniskillen to Olive Branch (Mississippi) | 4,005.32 mi (6,445.94 km) |
| Enniskillen to Olivehurst (California) | 4,892.21 mi (7,873.25 km) |
| Enniskillen to Olney (Maryland) | 3,302.37 mi (5,314.65 km) |
| Enniskillen to Olympia (Washington) | 4,479.93 mi (7,209.75 km) |
