Notes:
* Truman was not on the ballot in Alabama
* There were a few "other" votes in Kentucky, but I couldn't find them on a county level. Similary there was one write-in in Nebraska
* Strangely enough, Thurmond was on the ballot in North Dakota (not that it mattered in any way)
Actually,
in Kentucky Thurmond
was on the ballot – he got up to six percent in some of the secessionist, cotton-growing Jackson Purchase counties – and so were Henry Wallace, Norman Thomas, Claude Watson and Socialist Labor Party nominee Edward Teichert.
Thurmond was in clear third place in 93 of Kentucky’s 120 counties, and in the eastern coal counties of Knott and Magoffin zero third-party votes were cast. Wallace was in clear third place only in Elliott, Floyd, Johnson, Knox, Morgan and Wolfe counties (though with no more than 0.48 percent of the vote in any of them). The remaining nineteen would need detailed figures for all candidates to map.