1840 U.S. Census, Essex County, Virginia:
Written page 5
Dunn, Edmund
1 male age 5-10 [this would be Thomas Dunn]
1 male age 30-40 [this would be Edmund Dunn]
2 females age 20-30 [one of these would be Lucy Dunn]

1850 U.S. Census, Essex County, Virginia
Page 93
Dwelling 491, Family 491
Dunn, Edmund, 49, male, farmer, $800 real estate, born in Virginia
Dunn, Mary, 45, female, born in Virginia
Dunn, Thomas, 17, male, laborer, born in Virginia
Dunn, Lucy, 8, female, born in Virginia
Dunn, Indianna, 5, female, born in Virginia
Ursery, Lucy, 36, female, born in Virginia, unable to read or write [mark unclear]
Foreacres, Patsy, 50, female, born in Virginia, unable to read or write, blind

Thomas H. Dunn married Mary Elizabeth Dunn on 7 January 1857 in Essex County, Virginia. Both were 23, both born and living in Essex County, Virginia. He was a farmer. His parents were Edmund and Lucy Dunn; hers were Sam and Elizabeth Dunn. Peter Ainslie performed the ceremony. [Essex County, Virginia, Marriage Register 1, page 4, entry 19.]

1860 U.S. Census, Essex County, Virginia:
Dwelling 600, Family 584
Dunn, Thomas, 26, laborer, $50 personal estate, unable to read or write
Dunn, Mary E., 25
Dunn, Columbia A., 7/12

Thomas H. Dunn was a member of the 55th Virginia Infantry during the Civil War: Dunn, Thomas H.: Resident of Essex Co. Illiterate. Enl. 6/12/61 in Co. B, as a drummer. Transferred to Co. K, 5/1/62. Present for duty on every single survivng record through 12/31/64, final roll. Entered the R. E. Lee Camp Soldiers’ Home on 4/11/1906 and died there on 8/2/1911, aged 78. Buried in Hollywood Cemetery, Richmond. [Richard O’Sullivan, 55th Virginia Infantry (Lynchburg, Virginia: H. E. Howard, Inc., 1989), 121.]

1870 U.S. Census, Essex County, Virginia:
Dwelling 1631, Family 1631
Dunn, Thomas, 36, farmer, $125 personal estate
Dunn, Mary, 36, keeping house
Dunn, Columbia A., 9, at home
they were double-listed in Dwelling 1821, Family 1821:
Dunn, Thomas, 36, work in grist mill
Dunn, Mary, 32, keeping house
Dunn, Columbia, 9, at home

1880 U.S. Census, Middlesex County, Virginia
Jamaica District, page 261
Dwelling 19, Household 19
Dunn, Thos. H., white, male, 46, miller, born in Virginia, both parents born in Virginia
Dunn, Mary, white, female, 46, keeping house, born in Virginia, both parents born in Virginia
Dunn, Columbia, white, female, 20, teacher, born in Virginia, both parents born in Virginia
Griffith, Mary F., white, female, 13, servant, cook, cannot read or write, born in Virginia, both parents born in Virginia

On 7 July 1883, an agreement was drawn up by the heirs of Edmund Dunn, deceased. His children were Thomas H. Dunn (who married Mary E. Dunn), Indiana Dunn (who married John Hay), and Lucy Dunn (who married John J. Dunn). [Essex County, Virginia, Deed Book 54, pages 205–206.]