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

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

On 26 February 1873, Samuel C. Dunn made a deed of gift, in consideration of the natural love and affection I have and bear towards my granddaughter Colombia Dunn the child of my daughter Mary do hereby give and grant unto her one bay mare Colt, one red Cow, and one yearling ox or steer. Signed Samel [sic] C Dunn. On 17 January 1876 ordered to record. [Essex County, Virginia, Deed Book 52, page 912.]

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