Not sure if this is the right spot for this, but I read once (unsure if it is true) that the single most support a Republican Presidential candidate has ever gotten from a county in history was Barry Goldwater in Holmes County, Mississippi, 1964 (96.6%). If this is true, this is pretty ironic because Holmes hadn't voted for a Republican since 1872 and hasn't since 1964.
Very interesting. I looked up the election history of Holmes County and found out that in 1956 there was a Southern Unpledged Delegate movement just like in 1960 although somewhat less successful. Since 1956 was not even close as compared to 1960 and the Unpledged Delegate movement was fairly successful in MS and AL in 1960 I never bothered to look in detail at 1956 Deep South state results.
It seems things were never the same in the Deep South after 1948. In 1952 there was a surge of support for the GOP in the Deep South which I assume was a continuation of the 1948 Dixecrat revolt. And in 1956 and 1960 that revolt manifested itself in the Unpledged Delegate movement. Holmes County vote for the GOP ranged around 100 votes until 1952 when it surged to 47.8%. In 1956 it collapsed again when most of that surge went to the Unpledged Delegate.