| Killarney to Orangevale (California) | 4,948.09 mi (7,963.19 km) |
| Killarney to Orchards (Washington) | 4,605.11 mi (7,411.21 km) |
| Killarney to Orcutt (California) | 5,132.87 mi (8,260.56 km) |
| Killarney to Oregon (Ohio) | 3,410.21 mi (5,488.20 km) |
| Killarney to Oregon (Wisconsin) | 3,590.18 mi (5,777.84 km) |
| Killarney to Oregon City (Oregon) | 4,625.86 mi (7,444.60 km) |
| Killarney to Orem (Utah) | 4,541.54 mi (7,308.90 km) |
| Killarney to Orinda (California) | 5,023.87 mi (8,085.14 km) |
| Killarney to Orland Park (Illinois) | 3,588.76 mi (5,775.55 km) |
| Killarney to Orlando (Florida) | 3,938.64 mi (6,338.63 km) |
| Killarney to Ormond Beach (Florida) | 3,888.11 mi (6,257.30 km) |
| Killarney to Oro Valley (Arizona) | 4,930.53 mi (7,934.93 km) |
| Killarney to Oroville (California) | 4,914.37 mi (7,908.91 km) |
| Killarney to Oshkosh (Wisconsin) | 3,510.05 mi (5,648.88 km) |
| Killarney to Oskaloosa (Iowa) | 3,790.06 mi (6,099.51 km) |
