Elk County PA for some reason.
Heavily German Catholic but with apparently a lot of polarization and a very noticeable Smith effect.
All three Pennsylvania counties won by Smith (Elk, Lackawanna and Luzerne):
-were heavily Catholic
-had been consistently Republican between 1896 and 1924
-had MASSIVE turnout increases for Smith
-had a turnout decrease in 1932
Lackawanna and Luzerne had a very noticeable turnout decrease and barely budged as for percentage margin.
In Elk the turnout decrease was small and apparently this favoured Hoover, who took more rae votes in 1932 than in 1928.
I have no better explanation.