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Hamilton County New York Genealogy and History

County seat: Lake Pleasant

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Search Free Hamilton County New York Genealogy and Family History Records Online including census, cemetery, vital, military and other genealogical and historical records that can be used for your family history research.

Hamilton County, New York genealogy and family history page is a place where you can come in and research your genealogy and family history. We also do our best to provide a history of the area, to provide you with an overview of the time in which your ancestors lived.

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Hamilton County History

For the history of Hamilton County prior to 1816, see Montgomery County, New York.

On April 12, 1816, Hamilton County was created by partitioning 1,800 square miles (4,700 km2) from Montgomery County, but due to low population it remained unorganized and administered from Montgomery County, N.Y. until it was recognized as sufficiently organized for self-government on January 1, 1838. The organization process was completed by Summer of 1847.

On April 6, 1860, Fulton County was partitioned, with 10 square miles (26 km2) of land in Sacandaga Park transferred to Hamilton County.

On May 24, 1915, land was swapped between Hamilton and Essex counties, with Hamilton ceding Fishing Brook Mountain for Indian Lake. Hamilton gained an additional 20 square miles (52 km2), whereas Essex County lost 30 square miles (78 km2). This left Hamilton with its present size of 1,830 square miles (4,700 km2).

The former town of Gilman was dissolved in 1860. The original county seat was Sageville, now part of Lake Pleasant.

Free Hamilton County New York Genealogy Records Online

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Genealogy Research in Hamilton County, New York

Hamilton County Clerk
102 Co. Rd 11
Lake Pleasant, NY 12108
Phone: (518) 548-7111

Adjacent counties