Green’s Dictionary of Slang

a native or inhabitant of Pennsylvania.

1784		Mass. Centinel 19 May 2/1: John the Pennamitte [...] presented Joseph the ferryman with precious stones, and oil-olive [DA].
1835		H.C. Todd Notes upon Canada and the USA 23: Pennsylvanians are also called Panamites, and a justice denominated squire [DA].
1872		Harper’s Mag. Jan. 318/1: Below will be found a careful compilation of the various nicknames given to the States and people of this republic: [...] Pennsylvania, Pennites, and Leatherheads [DA].
1896		D.L. Leonard Century of Congregationalism in Ohio 40: The number of Pennamites [Presbyterians from Pennsylvania] and Pilgrims [Congregationalists from New England] might be nearly equal [DA].
1952		D. Shulman ‘Nicknames of States and Their Inhabitants’ in AS XXVII:3 183: The following nicknames may be included with those given by Mencken: Pennemites for Pennsylvanians, Tuckahoes for Virginians, and Corn Crackers for Tennesseans.