| Killarney to Odessa (Texas) | 4,629.52 mi (7,450.49 km) |
| Killarney to Ogden (Utah) | 4,502.59 mi (7,246.21 km) |
| Killarney to Oildale (California) | 5,054.69 mi (8,134.73 km) |
| Killarney to Ojus (Florida) | 4,014.87 mi (6,461.31 km) |
| Killarney to Okemos (Michigan) | 3,404.01 mi (5,478.22 km) |
| Killarney to Oklahoma City (Oklahoma) | 4,258.85 mi (6,853.95 km) |
| Killarney to Okmulgee (Oklahoma) | 4,192.27 mi (6,746.81 km) |
| Killarney to Olathe (Kansas) | 3,987.54 mi (6,417.32 km) |
| Killarney to Old Jamestown (Missouri) | 3,810.91 mi (6,133.07 km) |
| Killarney to Oldsmar (Florida) | 4,016.20 mi (6,463.45 km) |
| Killarney to Olean (New York) | 3,189.41 mi (5,132.85 km) |
| Killarney to Olive Branch (Mississippi) | 3,976.79 mi (6,400.02 km) |
| Killarney to Olivehurst (California) | 4,937.35 mi (7,945.90 km) |
| Killarney to Olney (Maryland) | 3,258.95 mi (5,244.78 km) |
| Killarney to Olympia (Washington) | 4,542.37 mi (7,310.23 km) |
