| Cobh to Odessa (Texas) | 4,682.53 mi (7,535.81 km) |
| Cobh to Ogden (Utah) | 4,552.59 mi (7,326.69 km) |
| Cobh to Oildale (California) | 5,104.46 mi (8,214.84 km) |
| Cobh to Ojus (Florida) | 4,067.06 mi (6,545.31 km) |
| Cobh to Okemos (Michigan) | 3,457.27 mi (5,563.95 km) |
| Cobh to Oklahoma City (Oklahoma) | 4,311.93 mi (6,939.38 km) |
| Cobh to Okmulgee (Oklahoma) | 4,245.45 mi (6,832.39 km) |
| Cobh to Olathe (Kansas) | 4,040.49 mi (6,502.53 km) |
| Cobh to Old Jamestown (Missouri) | 3,864.18 mi (6,218.80 km) |
| Cobh to Oldsmar (Florida) | 4,069.03 mi (6,548.47 km) |
| Cobh to Olean (New York) | 3,242.90 mi (5,218.94 km) |
| Cobh to Olive Branch (Mississippi) | 4,030.27 mi (6,486.09 km) |
| Cobh to Olivehurst (California) | 4,985.65 mi (8,023.63 km) |
| Cobh to Olney (Maryland) | 3,312.39 mi (5,330.78 km) |
| Cobh to Olympia (Washington) | 4,587.99 mi (7,383.65 km) |
