Killashee is the kind of village that does not appear in most guidebooks, which is accurate. The name comes from Irish: Cill Lasair, 'Church of Lasair,' where Lasair was an early Irish saint. The village sits a few kilometres south of Longford town, along quiet roads where the traffic is mostly local.
There is a church, modest and old. There are houses scattered along the road. There are fields. If you pass through on a weekday afternoon, you will likely be alone, or nearly. That is not a complaint.
Come here if you want to see what the landscape looked like before tourism found it. Stay in Longford town or Ballymahon — both are nearby — and drive out through Killashee on a quiet morning. You will have seen something real.
The reason to come back. The things every local will eventually tell you about, usually after the second pint.
Longford town is 5 kilometres north. From Dublin, take the N4 to Longford, then local roads south. The drive from Longford town is 10 minutes.
Bus service through Longford; Killashee is a small stop on the route. Check local schedules.
Longford station is 5km north — on the Dublin–Sligo/Westport line, about 1h 45m to Dublin Connolly.
Dublin Airport is 2 hours. Shannon is 2 hours. Longford is not a fly-in destination.