Geary:      50–60%      60–70%      70–80% Andrew Gregg Curtin Republican John W. Geary Republican The 1866 Pennsylvania gubernatorial election occurred on October 9, 1866.

Incumbent governor Andrew Gregg Curtin, a Republican, was not running for re-election.

Republican candidate John W. Geary defeated Democratic candidate Hiester Clymer to become Governor of Pennsylvania.

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