Charleville Castle is located just outside the town of Tullamore, Offaly, Ireland.
If traveling from Dublin take the N6 and follow it until you see the turn off for Kilbeggan/Tullamore (N52) Your not far from it now, there is a new bypass around the town now so if you choose to use it turn off at the fifth round about. You can get a better idea of the bypass until google updates it’s maps by looking at this map.
Tullamore is served by the Dublin to Galway train service. Times for trains can be found on the Irishrail website.
Tullamore is served from Dublin by Kerns bus. Timetables can be found on their website. Nearby towns such as Kilbeggan and Tyralspass are served by the Citylink bus route although both are a bit of a distance from tullamore..