Hi -We just returned from Tullamore and were lucky to visit the Offaly (genealogy) Research Center. The Catholic church in the heart of Tullamore is called Church of the Assumption. It was built in 1906 on the site of an earlier church from 1802 (but not sure if that was Catholic). It was almost completely destroyed by fire in 1980's but was rebuilt. It looks old on the exterior but very modern and beautiful on the interior. A Facebook page has an old picture of the inside of the church at (https://www.facebook.com/OffalyHistory
) and there are many pictures of the old church online as well as current ones. Hope this helps.