The Democratic state convention met on September 6 and 7 at Albany, New York.
;[1][2] The Republican state convention met on September 20 at Syracuse, New York.
Ward Hunt and John K. Porter were nominated for the Court of Appeals by acclamation.
27 Republicans and 5 Democrats were elected to a two-year term (1866–67) in the New York State Senate.
91 Republicans and 37 Democrats were elected for the session of 1866 to the New York State Assembly.