The 11th New York State Legislature, consisting of the New York State Senate and the New York State Assembly, met from January 9 to March 22, 1788, during the eleventh year of George Clinton's governorship, in Poughkeepsie.

Under the provisions of the New York Constitution of 1777, the State Senators were elected on general tickets in the senatorial districts, and were then divided into four classes. Six senators each drew lots for a term of 1, 2, 3 or 4 years and, beginning at the election in April 1778, every year six Senate seats came up for election to a four-year term. Assemblymen were elected countywide on general tickets to a one-year term, the whole assembly being renewed annually.

In March 1786, the Legislature enacted that future Legislatures meet on the first Tuesday of January of each year unless called earlier by the governor. No general meeting place was determined, leaving it to each Legislature to name the place where to reconvene, and if no place could be agreed upon, the Legislature should meet again where it adjourned.

In 1786, Columbia County was partitioned from Albany County, and 3 of Albany's Assembly seats were apportioned to Columbia.

The State election was held from April 24 to 26, 1787. Senators Samuel Townsend (Southern D.) and Jacobus Swartwout (Middle D.) were re-elected; and James Duane, John Laurance (both Southern D.), Anthony Hoffman (Middle D.) and Jellis Fonda (Western D.) were also elected to the Senate.

The State Legislature was to meet on January 1, 1788, at Poughkeepsie, but the Assembly first had a quorum on January 9, the Senate on January 11; both Houses adjourned on March 22, 1788.

On February 1, 1788, the Legislature passed a resolution for the election of delegates to a Convention to deliberate upon the adoption of the U.S. Constitution. The Convention met from June 17 to July 26, 1788, at Poughkeepsie and ratified the Constitution by a vote of 30 to 27. From this time, the politicians were divided in two political parties: those who voted for the Constitution were henceforth known as Federalists, those who voted against it as Anti-Federalists, or Democratic-Republicans.

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