He married Ethel Hall in 1927 in Marion County, Tennessee.
He died in 1984. He is buried in Cedar Hill Cemetery in Scottsboro, Jackson County, Alabama.
"Tennessee, County Marriages, 1790-1950," database with images, FamilySearch (: 22 December 2016), Lewis Letson and Ethel Hall, 13 Aug 1927; citing Marion, Tennessee, United States, Marriage, p. 122, Tennessee State Library and Archives, Nashville and county clerk offices from various counties; FHL microfilm 1,012,106.
"Alabama, World War II Draft Registration Cards,1940-1945," database with images, FamilySearch (: 14 August 2019), Louis Etheridge Letson, 16 Oct 1940; from records extracted by FamilySearch and images digitized by Ancestry; citing Scottsboro, Jackson, Alabama, United States, "Draft Registration Cards for Alabama, 10/16/1940 – 3/31/1947", NARA Records of the Selective Service System, 1926 - 1975, RG 147. National Archives at St. Louis, Missouri, n.d.
"United States Social Security Death Index," database, FamilySearch (: 20 May 2014), Louis Letson, Jun 1984; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
Find A Grave, database and images (https://www.findagrave.com: accessed 20 January 2020), memorial page for Louis E. Letson, Sr (22 Nov 1907–18 Jun 1984), Find A Grave Memorial no. 119283859, citing Cedar Hill Cemetery, Scottsboro, Jackson County, Alabama, USA; Maintained by Jamie "BamaFann" (contributor 46618298).
"United States Census, 1930," database with images, FamilySearch (: accessed 21 January 2020), Louis Letson, Crow, Jackson, Alabama, United States; citing enumeration district (ED) ED 42, sheet 1A, line 7, family 2, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 21; FHL microfilm 2,339,756.
"United States Census, 1940," database with images, FamilySearch (: 27 July 2019), Louis Letson, Election Precinct 21, Jackson, Alabama, United States; citing enumeration district (ED) 36-26, sheet 20B, line 48, family 364, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 41.