Place:Allegany, New York, United States

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Allegany County is a county in the Southern Tier of the U.S. state of New York. As of the 2020 census, the population was 46,456. Its county seat is Belmont. Its name derives from a Lenape word, applied by European-American settlers of Western New York State to a trail that followed the Allegheny River; they also named the county after this.

The county is bisected by the Genesee River, flowing north to its mouth on Lake Ontario. During the mid-nineteenth century, the Genesee Valley Canal was built to link southern markets to the Great Lakes and Mohawk River. The county was also served by railroads, which soon superseded the canals in their capacity for carrying freight. Part of the Oil Springs Reservation, controlled by the Seneca Nation, is located in the county.



the text in this section is copied from an article in Wikipedia

For centuries, Allegany County was the territory of the Seneca people, at the westernmost nation of the Five Nations of the Haudenosaunee, a confederacy of Iroquoian languages-speaking peoples. European-American permanent settlement did not take place until after the American Revolutionary War and the forced cession by the Seneca of most of their lands in western New York. New York State sold off the lands cheaply to attract new European-American settlers and agricultural development.

Allegany County was created by the state legislature on April 7, 1806, when Genesee County, New York, was partitioned to set aside some to the new county. The first County Seat was established at Angelica, New York, where it remained for half a century. It was later moved to Belmont, a village located along the Genesee River. On March 11, 1808, the borders were adjusted so that of Steuben County passed to Allegany County, and of Allegany County passed to Genesee County. This established the current border between Genesee and Steuben counties, and reduced the size of Allegany County to . On June 12, 1812, the legislature authorized the attachment of Cattaraugus County, New York, to Allegany County for administration reasons, but for practical reasons this action did not take place at that time. However, on April 13, 1814, the eastern half of Cattaraugus County was so attached and administered from Belmont. This attachment was ended on March 28, 1817. With continued settlement through the mid-nineteenth century, the legislature periodically adjusted county borders as new counties were organized in western New York. On April 1, 1846, Allegany County lost to Wyoming County, reducing the size of Allegany County to , and establishing the current border between Allegany and Wyoming counties. On May 11, 1846, Allegany County lost to Livingston County, reducing the total to , and establishing the western portion of the current border with Livingston County. On March 23, 1857, Allegany County lost another to Livingston County, passing the Ossian, New York, area to Livingston County, and establishing the current border between them.


Date Event Source
1806 County formed Source:Red Book: American State, County, and Town Sources
1807 Land records recorded Source:Red Book: American State, County, and Town Sources
1810 First census Source:Population of States and Counties of the United States: 1790-1990
1860 No significant boundary changes after this year Source:Population of States and Counties of the United States: 1790-1990

Population History

source: Source:Population of States and Counties of the United States: 1790-1990
Census Year Population
1810 1,942
1820 9,330
1830 26,276
1840 40,975
1850 37,808
1860 41,881
1870 40,814
1880 41,810
1890 43,240
1900 41,501
1910 41,412
1920 36,842
1930 38,025
1940 39,681
1950 43,784
1960 43,978
1970 46,458
1980 51,742
1990 50,470

Research Tips

External links

  • Outstanding guide to Allegany County family history and genealogy resources (FamilySearch Research Wiki). Birth, marriage, and death records, censuses, wills, deeds, county and town histories, cemeteries, churches, newspapers, libraries, and genealogical societies.

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