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County · code 36003

Allegany CountyNew York

Allegany County is a county in New York, with its seat in Belmont, formed on April 7, 1806. The county was created from Genesee County and named after the Allegheny River.

  • Founded1806
  • County seatBelmont
  • Named forAllegheny River
  • Land area1,029 sq mi + 5 sq mi water
  • Population46,456 2020 Census
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Updated

WyomingPotter, PALivingstonSteubenCattaraugus Belmont Census outline · seat marked

Where it is

Allegany on the map of New York

New York has 62 counties and county equivalents, each with its own records office. Shapes with a page are links.

Albany CountyBronx CountyBroome CountyCattaraugus CountyCayuga CountyChautauqua CountyChemung CountyChenango CountyClinton CountyColumbia CountyCortland CountyDelaware CountyDutchess CountyErie CountyEssex CountyFranklin CountyFulton CountyGenesee CountyGreene CountyHamilton CountyHerkimer CountyJefferson CountyKings CountyLewis CountyLivingston CountyMadison CountyMonroe CountyMontgomery CountyNassau CountyNew York CountyNiagara CountyOneida CountyOnondaga CountyOntario CountyOrange CountyOrleans CountyOswego CountyOtsego CountyPutnam CountyQueens CountyRensselaer CountyRichmond CountyRockland CountySt. Lawrence CountySaratoga CountySchenectady CountySchoharie CountySchuyler CountySeneca CountySteuben CountySuffolk CountySullivan CountyTioga CountyTompkins CountyUlster CountyWarren CountyWashington CountyWayne CountyWestchester CountyWyoming CountyYates CountyAllegany County Allegany
Counties of New York · Allegany highlighted

History

Formed in 1806 from Genesee County

An old deed may name a county that no longer exists, or a boundary that has since moved.

Allegany County was created from Genesee County on April 7, 1806. In 1808, the county gained territory from Steuben County but lost land to the creation of Cattaraugus and Niagara counties. Over the following decades, Allegany County lost additional territory to Wyoming, Livingston, and Cattaraugus counties.

Boundary changes from the Newberry Library, Atlas of Historical County Boundaries; the 5 that matter most are shown first.

  1. 1806
    Allegany County created Allegany created from Genesee.
    from Genesee
    · N.Y. Laws 1806, 29th sess., ch. 162, sec. 1/p. 604
  2. 1808
    Gained territory Allegany gained from Steuben, lost to Genesee, and lost to creation of Cattaraugus and Niagara.
    from Steubenfrom Geneseefrom Cattaraugusfrom Niagara
    · N.Y. Laws 1808, 31st sess., ch. 38/p. 263; ch. 40, secs. 1-2/p. 266
  3. 1846
    Lost territory Allegany lost to Wyoming.
    to Wyoming
    · N.Y. Laws 1846, 69th sess., ch. 51/p. 53
  4. 1846
    Lost territory Allegany lost to Livingston.
    to Livingston
    · N.Y. Laws 1846, 69th sess., ch. 197, sec. 1/p. 235
  5. 1857
    Lost territory Allegany lost to Livingston.
    to Livingston
    · N.Y. Laws 1857, 80th sess., ch. 166/p. 366
Show all 8 changes (3 more)
  1. 1806
    Allegany County created Allegany created from Genesee.
    from Genesee
    · N.Y. Laws 1806, 29th sess., ch. 162, sec. 1/p. 604
  2. 1808
    Gained territory Allegany gained from Steuben, lost to Genesee, and lost to creation of Cattaraugus and Niagara.
    from Steubenfrom Geneseefrom Cattaraugusfrom Niagara
    · N.Y. Laws 1808, 31st sess., ch. 38/p. 263; ch. 40, secs. 1-2/p. 266
  3. 1812
    Changed Legislature authorized Cattaraugus to be attached to Allegany, but attachment did not take effect.
    Cattaraugus
    · N.Y. Laws 1812, 35th sess., ch. 173/p. 517
  4. 1814
    Changed Eastern half of Cattaraugus was detached from Niagara, attached to Allegany for administrative and judicial purposes.
    CattaraugusNiagara
    · N.Y. Laws 1814, 37th sess., ch. 123/p. 146
  5. 1817
    Changed Cattaraugus fully organized, detached from Allegany.
    Cattaraugus
    · N.Y. Laws 1816, 40th sess., ch. 115, sec. 1/p. 107
  6. 1846
    Lost territory Allegany lost to Wyoming.
    to Wyoming
    · N.Y. Laws 1846, 69th sess., ch. 51/p. 53
  7. 1846
    Lost territory Allegany lost to Livingston.
    to Livingston
    · N.Y. Laws 1846, 69th sess., ch. 197, sec. 1/p. 235
  8. 1857
    Lost territory Allegany lost to Livingston.
    to Livingston
    · N.Y. Laws 1857, 80th sess., ch. 166/p. 366

Land and parcels

What the maps cover in Allegany

Who publishes each layer, how good it is, and when we last checked.

Official
from the office that keeps the record
Good enough
a reliable statewide or national copy
Fallback
a guide only; check the official record
Missing
nothing public found yet

People and land

Allegany by the Census

Population
46,456 2020 Census count
Housing units
23,454 2020 Census count
Land area
1,029 square miles
Water area
5 square miles
People per sq mi
45 population ÷ land area

Source: US Census Bureau, 2020 Census; US Census Bureau, 2020 Gazetteer Files. Not endorsed or certified by the Census Bureau.

Rules and offices

Who to ask before you build, dig or sell

Official county pages only. We link to them; we do not copy them, because they change.

Inside a city or town, permits usually come from that city rather than the county.

Permits

County government

See your own lot on these maps

Open Allegany County on Parcel Chart's free map and click your parcel. Save it with a free account; the full record of your place (site map, projects, documents) is Pro, in early access.

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Questions

Common questions about Allegany County

When was Allegany County founded?
Allegany County was founded in 1806, formed from Genesee County, and named after Allegheny River.
What is the county seat of Allegany County?
The county seat of Allegany County is Belmont.
Is there an online parcel map for Allegany County?
Not that we have found yet. Lot lines and owners of record are kept by the county assessor's office. When a public parcel map appears, it shows here.
Has Allegany County's boundary or name changed?
Allegany County was created in 1806 from Genesee County. Since then the Atlas of Historical County Boundaries records 7 later changes, chiefly involving Cattaraugus County, Livingston County and Niagara County.
Who issues septic and well permits in Allegany County?
The county's page on septic systems and wells: Health department: septic and well.
Is my lot in a flood zone?
We do not have flood maps for Allegany County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

Nearby

Counties next door