"United States Census, 1820," database with images, FamilySearch(https://familysearch.org/ark:/61903/1:1:XHLH-LWH : accessed 14 July 2017), Major Scott, Drummond, Accomack, Virginia, United States; citing p. 52, NARA microfilm publication M33, (Washington D.C.: National Archives and Records Administration, n.d.), roll 129; FHL microfilm 193,688.
"United States Census, 1840," database with images, FamilySearch(https://familysearch.org/ark:/61903/1:1:XHBM-Q53 : 24 August 2015), Major Scott, Accomack, Virginia, United States; citing p. 80, NARA microfilm publication M704, (Washington D.C.: National Archives and Records Administration, n.d.), roll 549; FHL microfilm 29,683.
"United States Census, 1850," database with images, FamilySearch(https://familysearch.org/ark:/61903/1:1:M882-X5Z : 9 November 2014), Major Scott, Accomack county, Accomack, Virginia, United States; citing family 1164, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
"United States Census, 1860", database with images, FamilySearch(https://familysearch.org/ark:/61903/1:1:M4B1-4WM : 30 December 2015), Major Scott, 1860.
"United States Census, 1870," database with images, FamilySearch(https://familysearch.org/ark:/61903/1:1:MFL8-W87 : 17 October 2014), Major Scott, Virginia, United States; citing p. 159, family 1059, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 553,129.
"Virginia Deaths and Burials, 1853-1912," database, FamilySearch(https://familysearch.org/ark:/61903/1:1:X51Q-12Q : 12 December 2014), Major Scott, 30 Dec 1876; citing St. George, Accomack, Virginia, reference Item 2 No 1; FHL microfilm 2,056,972.
"Virginia Marriages, 1785-1940," database, FamilySearch(https://familysearch.org/ark:/61903/1:1:X5B7-JJZ : 5 December 2014), Major Scott in entry for Charles Allen and Elizabeth Scott, 28 Jan 1857; citing Accomack, Virginia, reference P.6 L-4; FHL microfilm 30,135.
"Virginia Marriages, 1785-1940," database, FamilySearch(https://familysearch.org/ark:/61903/1:1:X5BW-DVC : 5 December 2014), Major Scott in entry for Robert Scott and Maggie Melson, 09 Aug 1871; citing Accomack, Virginia, reference L-93 P31; FHL microfilm 30,135.
"Virginia Marriages, 1785-1940," database, FamilySearch(https://familysearch.org/ark:/61903/1:1:X5BW-DV1 : 5 December 2014), Major Scott in entry for David W. Scott and Peggy Fox, 06 Sep 1871; citing Accomack, Virginia, reference L-97 P31; FHL microfilm 30,135.
"Virginia Marriages, 1785-1940," database, FamilySearch(https://familysearch.org/ark:/61903/1:1:XRS3-Z6Y : 5 December 2014), Major Scott in entry for Thomas D. Scott and Sally C. Salsbury, 29 Jan 1875; citing Onancock, Virginia, reference P43 #88; FHL microfilm 30,135.
"Virginia Marriages, 1785-1940," database, FamilySearch(https://familysearch.org/ark:/61903/1:1:XRS3-TM3 : 5 December 2014), Major Scott in entry for David Scott and Ida Fox, 21 Jun 1882; citing Near Onancock, Virginia, reference P72 L 131; FHL microfilm 30,135.
There might be a bit more, but that's good for starters.