| 89th New York State Legislature | |||||||
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 The Old State Capitol (1879) | |||||||
| Overview | |||||||
| Legislative body | New York State Legislature | ||||||
| Jurisdiction | New York, United States | ||||||
| Term | January 1 – December 31, 1866 | ||||||
| Senate | |||||||
| Members | 32 | ||||||
| President | Lt. Gov. Thomas G. Alvord (R) | ||||||
| Temporary President | Charles J. Folger (R), from February 6 | ||||||
| Party control | Republican (27-5) | ||||||
| Assembly | |||||||
| Members | 128 | ||||||
| Speaker | Lyman Tremain (R) | ||||||
| Party control | Republican (90-38) | ||||||
| Sessions | |||||||
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The 89th New York State Legislature, consisting of the New York State Senate and the New York State Assembly, met from January 2 to April 20, 1866, during the second year of Reuben E. Fenton's governorship, in Albany.