St. Marys is a civil parish in County Westmeath, Ireland. It is located about 38.96km west–south–west of Mullingar.St. Mary's is the sole civil parish in the barony of Brawny in the Province of Leinster. The civil parish covers 12069.4acre.St. Mary's civil parish comprises part of the town of Athlone, the village of Ballykeeran and 62 townlands: Aghacocara, Ankersbower, Ardnaglug, Athlone, Ballygowlan, Ballykeeran, Blyry Lower, Blyry Upper, Bunnahinly, Bunnavally, Cannonsfield, Cappankelly, Carberry Island, Carrickobreen, Cartrontroy, Cloghanboy (Cooke), Cloghanboy (Homan), Cloghanboy (Strain), Cloghanboy West, Clonagh, Clonbrusk, Cloonbonny, Cloondalin, Collegeland, Cookanamuck, Coosan, Cornamaddy, Cornamagh, Corralena, Creaghduff, Creaghduff South, Creggan Lower, Creggan Upper, Crosswood, Curragh, Curragh (Mechum), Derries, Friars Island, Garrankesh, Garrycastle, Garrynafela, Goldenisland (St. George), Goldenisland, Goldenisland (Kilmaine), Hillquarter, Kilmacuagh (Castlemaine), Kilmacuagh (Cooke), Kilmacuagh (Mechum), Kilnafaddoge, Kippinstown, Lissywollen, Loughanaskin, Loughandonning, Magheranerla, Meehan, Moydrum, Retreat, Srameen, Tullin, Tullycross and Warrensfields.