Counties with the longest streak of voting for one party for President

[jimrtex]

Texas

D: Brooks, Duval, Jim Hogg, Maverick, Starr, Webb, Zapata (since at least 1936, maybe never R, except Webb and Zapata voted R in 1912)
R: Kendall (since at least 1936, maybe never D, though it voted I in 1912)
, Johnson (since 1932)

Brooks and Jim Hogg have always voted Democrat but they were only formed in 1912 and 1913.

Duval went for McKinley in 1896
Maverick for Hoover in 1928
Starr for Harrison in 1892
Webb for Taft in 1912
Zapata for Harding in 1920

Kendall for FD Roosevelt in 1932

[jimrtex]

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Snyder and Union results going back a bit, from here: http://staffweb.wilkes.edu/harold.cox/pres/indexpres.html

Snyder last went for the Democrats in 1856.

Union last went for the Democrats in 1832.

Pennsylvania had a curious electoral slate in 1856.  The Republicans and American Party shared 26 of 27 electors.  The 27th elector at the top of the ticket was either Frémont or Fillmore (each party pre-printed their own ballot).  In the event that the combined slate won, the parties agreed that the electors would split the electoral vote in proportion to the popular vote.  All was moot as the Democrats carried the state.   There was also a straight American ticket, which supported the national American party's generally pro-slavery platform.

Technically, Snyder County went with the Republican-American ticket, but more people voted Democrat than voted the American or Republican variants.  1856 was also Snyder's first election, having split from the southern half of Union County.