The 23rd New York State Legislature, consisting of the New York State Senate and the New York State Assembly, met from January 28 to April 8, 1800, during the fifth year of John Jay's governorship, in Albany.

Under the provisions of the New York Constitution of 1777, amended by the re-apportionment of March 4, 1796, Senators were elected on general tickets in the senatorial districts for four-year terms. They were divided into four classes, and every year about one fourth of the Senate seats came up for election. Assemblymen were elected countywide on general tickets to a one-year term, the whole assembly being renewed annually.

In 1797, Albany was declared the State capital, and all subsequent Legislatures have been meeting there ever since. In 1799, the Legislature enacted that future Legislatures meet on the last Tuesday of January of each year unless called earlier by the governor.

Congressman Jonathan N. Havens (D.-R.) died on October 25, 1799. Assemblyman John Smith (D.-R.) was elected in a special election in December 1799 to fill the vacancy.

In 1799, Cayuga County was split from Onondaga County, and was apportioned one seat in the Assembly, taken from Onondaga. Essex County was split from Clinton County, but remained in a double-county Assembly district.

At this time the politicians were divided into two opposing political parties: the Federalists and the Democratic-Republicans.

The State election was held from April 30 to May 2, 1799. Senators Richard Hatfield (Southern D.), Zina Hitchcock, Ebenezer Russell, Moses Vail (all three Eastern D.) and Vincent Mathews (Western D.) were re-elected. John B. Coles (Southern D.), Isaac Bloom, John Hathorn, John Suffern (all three Middle D.) and Moss Kent (Western D.) were also elected to the Senate.

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