This is a sortable table of the approximately 3,424 townlands in County Mayo, Ireland.^[1][2] as was the case prior to 1873.

It DOES show townlands in the Civil Parish of Inishbofin which were transferred to Galway from Mayo in 1873 and townlands transferred to Roscommon in 1899, around and including Ballaghaderreen. It DOES NOT show townlands transferred from Galway in 1899 or townlands transferred from Sligo in 1899.^{[citation needed]}

Duplicate names occur where there is more than one townland with the same name in the county. Names marked in bold typeface are towns, and the word Town appears for those entries in the Acres column.

Townland list