| Killarney to Oswego (Illinois) | 3,604.14 mi (5,800.30 km) |
| Killarney to Oswego (New York) | 3,054.35 mi (4,915.51 km) |
| Killarney to Otsego (Minnesota) | 3,648.01 mi (5,870.90 km) |
| Killarney to Ottawa (Illinois) | 3,638.08 mi (5,854.92 km) |
| Killarney to Ottawa (Kansas) | 4,018.37 mi (6,466.93 km) |
| Killarney to Ottumwa (Iowa) | 3,794.00 mi (6,105.85 km) |
| Killarney to Overland (Missouri) | 3,820.91 mi (6,149.16 km) |
| Killarney to Overland Park (Kansas) | 3,982.18 mi (6,408.69 km) |
| Killarney to Overlea (Maryland) | 3,226.46 mi (5,192.49 km) |
| Killarney to Oviedo (Florida) | 3,923.36 mi (6,314.03 km) |
| Killarney to Owasso (Oklahoma) | 4,152.33 mi (6,682.52 km) |
| Killarney to Owatonna (Minnesota) | 3,685.69 mi (5,931.54 km) |
| Killarney to Owensboro (Kentucky) | 3,733.88 mi (6,009.10 km) |
| Killarney to Owings Mills (Maryland) | 3,235.78 mi (5,207.48 km) |
| Killarney to Owosso (Michigan) | 3,382.16 mi (5,443.06 km) |
