The Ballaghaderreen area was formerly part of County Mayo. It has been identified with County Roscommon for well over a century. The meaning of its name in Gaelic Irish is "the way of the little oaks." <p>In 1859, a transfer of a Costello barony in Mayo to the barony of Frenchpark in Roscommon took place by act of Paliament. Ballaghderreen being its main town is the seat of the Roman Catholic diocese of Achrony.<p>Researchers should look for records in both Mayo and Roscommon counties.<br>
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