We will list all Families, by Earliest Ancestor and Line Leader who wish to be listed. We hope that eventually, all families will be listed on this page. We also hope to eventually locate descendants of each family and to arrange their participation in the DNA project. (Participation in the DNA Project is not a requirement for listing on this page, but we will indicate families who have a man representing them in the DNA Project .)

John b. c1732, Carlow, Ireland; m. Honor - Josephine Donahue [JoDonahue AT myfamily.com]
- James b. 15 Sep 1767, Borris, Carlow, Ireland, d. 21 Oct 1847; m. Mary Mulroney
  - Michael b. c1806, Ireland, d. 2 Aug 1870, Gardiner, Kennebec, ME; m. Ellen Joyce
    - James August b.1834, Coshill, Carlow, Ireland, d. 13 April 1885, Boston, Suffolk, MA; m Margaret Mooney
      - James Francis b. 6 Oct 1882, Boston, Suffolk, MA, m1 Johanna Crowley, m2 Bridget McDonough
James Costello b Castlereagh, Co. Roscommon 1781 m Ann - [ajcjh AT charter.net]
- Joseph John b Milborn Port, Dorset 1837 m Emily Jane Morse
  - John Joseph b Milborn Port 1867 m Susie Grant Bidgood
    - Denis b Highgate, London1905 m Jessie Medley
      - Anthony John b Finchley, London 1934
Michael Costello, b County Clare, Ire, m Bridget Haugh, d 8/5/1871, Davenport, IA - Mike Costello [mcostello25 AT comcast.net]
- Thomas, b 1832, County Clare, m Mary O'Donnell, 9/18/1865
  - John James, b 3/23/1882, m Elizabeth Cox, m Gertrude Putnam
    - Michael Joseph, b 6/10/1916, m W. Maxine Scott, d 4/1/1982 C-1
- Mary Jane. b 1845, County Clare, m Martin Patrick O'Dea
- Patrick, b 1844, County Clare, m Mary
- Martin, b 1850, County Clare, d 06/20/1899-Davenport, IA
  - Frank, b c 1884
  - Thomas, b 10/15/1887
  - Johanna, b 1871, m August Gibbons
  - Margaret, b 08/1869, m Patrick Dougherty
  - Mayme, b c 1870, m ?Flaherty
  - Michael, b c 1868
John Costello, b 1822 Ireland, m Margaret - forestgump1 [valcook1 AT gump1.wanadoo.co.uk]
- Mary Costello, b Ireland 1871, m Joseph Geddes

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