The 189th New York State Legislature, consisting of the New York State Senate and the New York State Assembly, met from January 9, 1991, to December 31, 1992, during the ninth and tenth years of Mario Cuomo's governorship, in Albany.

Under the provisions of the New York Constitution of 1938 and the U.S. Supreme Court decision to follow the One man, one vote rule, re-apportioned in 1982 by the Legislature, 61 Senators and 150 assemblymen were elected in single-seat districts for two-year terms. Senate and Assembly districts consisted of approximately the same number of inhabitants, the area being apportioned contiguously without restrictions regarding county boundaries.

At this time there were two major political parties: the Democratic Party and the Republican Party. The Conservative Party, the Right to Life Party, the Liberal Party, the New Alliance Party, the Libertarian Party, and the Socialist Workers Party also nominated tickets.

The New York state election, 1990, was held on November 6. Governor Mario Cuomo and Lieutenant Governor Stan Lundine were re-elected, both Democrats. The elections to the other two statewide elective offices resulted in the re-election of the two incumbent officeholders: a Republican Comptroller, and a Democratic Attorney General. The approximate party strength at this election, as expressed by the vote for Governor, was: Democrats 2,086,000; Republicans 866,000; Conservatives 828,000; Right to Life 138,000; Liberals 71,000; New Alliance 31,000; Libertarians 25,000; and Socialist Workers 13,000.

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