The Birminghams of Dalgin, parish of Addergoole, barony of Dunmore, county Galway, were descended from Major John Birmingham of Clondargin and Dalgin and his wife, Maud Bermingham of Kilbeg, parish of Ross, who married in the early 18th century. Following the death of John Birmingham in 1802 the estate was divided between his two sons, Michael (Dalgin) and Edward (Millbrook). Members of the Birmingham family held eight townlands in the parish of Annagh, barony of Costello, county Mayo and six townlands in the parish of Addergoole, barony of Dunmore, county Galway, at the time of Griffith's Valuation. Michael James Birmingham sold the Dalgin estate to his future brother-in-law, Denis J. Kirwan, in 1863. Kirwan also inherited the Millbrook part of the estate following the death of John Birmingham, author and astronomer, in 1884. In the 1870s John Birmingham of Millbrook owned 711 acres in county Mayo and 359 acres in county Galway.
- Baker, Ringwood & Gordon, solicitor's collection, includes chancery rentals of the estates of John Bermingham at Millbrook, Co Mayo [now Co Galway], 1898-1901. M3677; National Archives of Ireland
- Landed Estates' Court Rentals (O'Brien), Birmingham & Murphy, 3 July 1868, Vol 91, MRGS 39/044, (microfilm copy in NUIG); National Archives of Ireland
- Pedigree of De Bermingham of Dalgin, c 1641-1750. GO MS 175: 104; National Library of Ireland
- Pedigree of Birmingham, Barons Athenry and Earls of Louth and of Clondargin, Dalgen and Adergoole, Co Galway and of St. Sebastian, Spain, c 1200-1826. GO MS 170: 22-26 & 175-181; National Library of Ireland
- Miscellaneous [Blake] deeds, including leases of premises in Tuam and the Berminghams of Dalgin, 19th century. D 16,899-16,932; National Library of Ireland
- Minutes of evidence of Committee of Privileges on petition of Edward Bermingham of Dalgin, county Galway, to claim the title Baron of Athenry. London: [n.d]. ; Galway County Library
- Kirwan Papers, include a copy rental of the estate of Mrs Mary Louisa Birmingham of Dalgin for the year ending Nov 1858. LE8/8; James Hardiman Library, National University of Ireland, Galway
- Baker, Ringwood & Gordon, solicitor's collection, includes plain copy of will of John Bermingham of Milbrook, 20 Aug 1884. T.11628; National Archives of Ireland
Contemporary printed sources
- ''GRIFFITH'S VALUATION OF IRELAND'[Primary Valuation of Tenements]', 1850-1858. : Tuam Union, 109 (Dalgin) & 111 (Lack)
- LEET, Ambrose. ''A directory to the market towns, villages, gentlemen's seats, and other noted places in Ireland''. Dublin: Printed by B. Smith, 1814 : 147
- PARLIAMENTARY PAPERS. ''Return of owners of land of one acre and upwards, in the several counties .... in Ireland''. HC 1876, LXXX: 293 & 307
- HUSSEY DE BURGH, U. H. ''The Landowners of Ireland. An alphabetical list of the owners of estates of 500 acres or £500 valuation and upwards in Ireland''. Dublin: Hodges, Foster and Figgis, 1878. [available online at www.askaboutireland.ie] : 35
- PARLIAMENTARY PAPERS. ''Return of names of proprietors and area and valuation of properties in counties in Ireland, held in fee or perpetuity or long leases at chief rents,'' 1876. (412) LXXX. 395: 151
- WILSON, William. ''The Post-Chaise Companion or Travellers Directory Through Ireland''. The author: Dublin, 1786 : 128 (Dalygan)
Modern printed sources
- MOHR, Paul. ''John Birmingham Esq. Tuam and Ireland's New Star''. Co Galway: Millbrook Nova Press, 2002: All
- ''Jnl. of the Galway Archaeological and Historical Society'': MOHR, Paul. John Birmingham of Tuam: A Most Unusual Landlord. XLVI (1994), 111-155
- MOHR, Paul. John Birmingham of Millbrook - The Hidden Life. In CLAFFEY, John A. (ed). ''Glimpses of Tuam since the Famine''. The Old Tuam Society, 1997 : 107-121
- ''Dictionary of Scientific Biography'' New York: Scribner, 1970-80. : HOSKIN, M.A. John Birmingham. II, 146-147.
- ''Jnl. of the Galway Archaeological and Historical Society'': MOHR, Paul. The de Berminghams, Barons of Athenry. LXIII (2011), 43-56
- ''Jnl. of the Old Tuam Society'': MOHR, Paul. North Galway's lost leader - Michael Blake Birmingham of Dalgin. IV (2007), 49-57.