Allegany County, New York Genealogy

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Allegany County, New York
Map of New York highlighting Allegany County
Location in the state of New York
Map of the U.S. highlighting New York
Location of New York in the U.S.
Founded March 7, 1806
County Seat Belmont
Address 7 Court Street, Rm 3
Belmont, NY 14813
Named for: Allegany/Allegheny River
Ny-allegheny river325w.jpg

This article is about a southwestern New York county. For other uses, see Allegany.

Template:New York-stubUnited States Gotoarrow.png New York Gotoarrow.png Allegany County

Quick Facts

  • Named for the Allegany/Allegheny River passing through the county.
  • The southern part of the county lies within the oil field where the petroleum was first discovered in the USA at Titusville, Pennsylvania. Names such as Wellsville, Petrolia and Olean were oil-based. Oil played out but the natural gas is still an important resource.

Parent County

1683: Allegany County was part of Albany County.

7 March 1806: Set off from Genesee County. WorldCat 50140092 FHL Collection

Boundary Changes

  • 1808, a portion transferred from Steuben County.
  • 1811, a portion transferred to Genesee County.
  • 1812-1816, Cattaraugus County was included in Allegany County. Some of records kept at Belmont.
  • 1822, a portion transferred to Tioga County.
  • 14 May 1841, a portion was set off to create Wyoming County.

Record Loss

Place Names / Localities


Archives and Libraries


LDS Cemetery Records (in rural areas)

  • Vol. 1
    • page 41 - Kenyon Family Cemetery, near Nile
    • page 52 - Lattice Bridge Cemetery
    • page 65 - Norton Cemetery
    • page 79 - Swift Family Cemetery, near Cuba Lake
    • page 80 - Van Campen Creek Cemetery

Census Records



Source 1825 1835 1845 1855 1865 1875 1892 1905 1915 1925
Family History Library film - - - Yes Yes Yes Yes Yes Yes Yes
FamilySearch image - - - - - - Yes - - -
New York State Library film - - - Yes Yes Yes Yes Yes Yes Yes - - - - - - - - - -

Church History and Records

Court Records

Emigration and Immigration



Land and Property


Military History and Records


Probate Records


Vital Records

Societies, Libraries and Museums

Family History Center

Wellsville New York
100 Crescent Dr
Wellsville, Allegany, New York, United States
Phone: 585-593-3481
Hours: T 7pm-9pm Note:

These are not mailing addresses. Due to limited staff, Family History Centers are unable to respond to mail inquiries.