The Assembly districts were made up of entire towns, or city wards,[1] forming a contiguous area, all within the same county.

The approximate party strength at this election, as expressed by the vote for Governor, was: Republicans 366,000 and Conservative Union 352,000.

The Legislature met for the regular session at the Old State Capitol in Albany on January 1, 1867; and adjourned on April 20.

On January 15, the Legislature elected Roscoe Conkling (R) to succeed Ira Harris as U.S.

On January 31, Charles J. Folger was re-elected President pro tempore of the State Senate.

On the opening day, one of the delegates, Assemblyman L. Harris Hiscock was murdered at Stanwix Hall (a hotel in Albany).

Note: The Senators in the 90th Legislature had been elected in November 1865 for a two-year term under the apportionment of 1857, as listed below.