The 39th New York State Legislature, consisting of the New York State Senate and the New York State Assembly, met from January 30 to April 17, 1816, during the ninth year of Daniel D. Tompkins's governorship, in Albany.

Under the provisions of the New York Constitution of 1777, amended by the Constitutional Convention of 1801, 32 Senators were elected on general tickets in the four senatorial districts for four-year terms. They were divided into four classes, and every year eight 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.

State Senator Elbert H. Jones resigned on March 6, 1815, due to ill health, leaving a vacancy in the Southern District.

On April 8, 1815, the Legislature re-apportioned the Assembly districts, increasing the total number of assemblymen from 112 to 126. Genesee; Onondaga; Ontario and Seneca gained two seats each. Allegany & Steuben; Cattaraugus, Chautauqua & Niagara; Cayuga; Otsego; Rensselaer and Schoharie gained one seat each.

On April 17, 1815, the Legislature re-apportioned the Senate districts, to take effect in May 1815: Dutchess, Putnam and Rockland Co. (and 1 seat) were transferred from the Middle to the Southern District; Albany Co. from the Eastern, and Chenango, Otsego and Schoharie Co. from the Western (and 3 seats) were transferred to the Middle District; Herkimer, Jefferson, Lewis and St. Lawrence Co. (and 3 seats) were transferred from the Western to the Eastern 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 25 to 27, 1815.

Since the re-apportionment of the Senate districts had been enacted only a week before, and should take effect only in May 1815, the senators were elected under the previous apportionment.Peter R. Livingston, Isaac Ogden (both Middle D.), Henry J. Frey, Ralph Hascall, Abraham Van Vechten (all three Eastern D.), Henry Seymour, Stephen Bates (both Western D.); and Assemblyman David Allen (Eastern D.) were elected to full terms in the Senate. Jacob Barker (Southern D.) was elected to fill the vacancy. Allen, Frey, Hascall and Van Vechten were Federalists, the other five were Democratic-Republicans.

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