My Family Tree

David has family in Claiborne Co, TN living next to Isham in 1840 Census
Matching children and wife ages in family in Division 2, Pulaski, KY 1850; wife and children born in "E Tenn" in the 1850 Census.
In Pulaski, they live close to Stephen and Serena Hardy also from E.Tenn - prob Margaret's parents. Live next to John and Rebecca Hardy - could be her brother.

http://familytreemaker.genealogy.com/users/g/o/o/Lisa-A-Goodwin/WEBSITE-0001/UHP-0628.html
claims David died in AR or MO.

Notes by Bonnie Davenport:
only 3 children in Tax List 1853, 1854 => either Eliza already married or 1 of Eliza or Elizabeth had died.
land sale indicates they left Pulaski around 1856,1857
1859 Greene Co ,AR Clementine first married. (Green Co, AR next to Dunklin Co, MO)
1860 Thomas living in Stoddard Co, MO and married May 1 1861 there.

Only possible match for David Davenport afterwards is this:
Home in 1870: Boone, Douglas, Missouri
David Devenport 54 VA
Lorenia Devenport 43 Germany
John F Devenport 15 MO
Mary M Devenport 13 AR
Robert Dishman 15
Senia Dishman 18
Margaret Dishman 10

David appears to have moved to Benton, Fulton Co, AR by 1880 and son, John F Davenport, also there and subsequently.
David Davenport 64 VA
Everline Davenport 42 KY
Martha Decker 1M (May 1880 AR "granddaughter") --> Eliza or Elizabeth married a Decker.
There is a John F and Elizabeth Decker in 1870 Benton, AR, but Elizabeth is gone by 1880.

Found George Davenport and Clementine Carter neighbors in 1900 Union, Dunklin Co, MO