When was Montgomery County founded?

Montgomery County was founded in 1772, formed from Albany County, and named after Richard Montgomery.

What is the county seat of Montgomery County?

The county seat of Montgomery County is Fonda.

Is there an online parcel map for Montgomery County?

Yes. New York State Geographic Information Systems (GIS) Clearinghouse publishes a parcel map of 25,260 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.

Has Montgomery County's boundary or name changed?

Montgomery County was created in 1772 from Albany County. Since then the Atlas of Historical County Boundaries records 9 later changes, chiefly involving Herkimer County, Hamilton County and Clinton County. It was formerly called Tryon.

Is my lot in a flood zone?

We do not have flood maps for Montgomery County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

County · code 36057

Montgomery CountyNew York

Montgomery County is in New York, with its seat in Fonda. It was created in 1772 from Albany County and named after Richard Montgomery.

Founded1772
County seatFonda
Named forRichard Montgomery
Land area403 sq mi + 7.2 sq mi water
Population49,532 2020 Census
Parcels mapped25,260 checked 15 October 2026

Open the free map Click any parcel in Montgomery County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated 19 October 2026

Census outline · seat marked

History

Formed in 1772 from Albany County

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

Originally called Tryon County when created from Albany in 1772, it was renamed Montgomery in 1784. Over its early years, the county lost territory to the creation of Ontario, Herkimer, Otsego, Tioga, Clinton, Essex, Saratoga, Washington, Hamilton, and Fulton counties.

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

1772
Montgomery County created Tryon (now Montgomery) created from Albany. Tryon's western boundary is estimated, since no western limit was specified. New York's western boundary was not definitively established until 1782.
from Albany
12 March 1772 · N.Y. Col. Laws, ch. 1534/5:321
1784
Renamed Tryon renamed Montgomery.
formerly Tryon
2 April 1784 · N.Y. Laws 1784, 7th sess., ch. 17/p. 21
1789
Lost territory Montgomery lost to creation of Ontario.
to Ontario
27 January 1789 · N.Y. Laws 1789, 12th sess., ch. 11/p. 10
1791
Lost territory Montgomery lost to creation of Herkimer, Otsego, and Tioga.
to Herkimer to Otsego to Tioga
16 February 1791 · N.Y. Laws 1791, 14th sess., ch. 10/p. 206
1797
Gained territory Montgomery gained from Herkimer.
from Herkimer
31 March 1797 · N.Y. Laws 1797, 20th sess., ch. 74/p. 100

Show all 10 changes (5 more)

1772
Montgomery County created Tryon (now Montgomery) created from Albany. Tryon's western boundary is estimated, since no western limit was specified. New York's western boundary was not definitively established until 1782.
from Albany
12 March 1772 · N.Y. Col. Laws, ch. 1534/5:321
1784
Renamed Tryon renamed Montgomery.
formerly Tryon
2 April 1784 · N.Y. Laws 1784, 7th sess., ch. 17/p. 21
1789
Lost territory Montgomery lost to creation of Ontario.
to Ontario
27 January 1789 · N.Y. Laws 1789, 12th sess., ch. 11/p. 10
1791
Lost territory Montgomery lost to creation of Herkimer, Otsego, and Tioga.
to Herkimer to Otsego to Tioga
16 February 1791 · N.Y. Laws 1791, 14th sess., ch. 10/p. 206
1797
Gained territory Montgomery gained from Herkimer.
from Herkimer
31 March 1797 · N.Y. Laws 1797, 20th sess., ch. 74/p. 100
1801
Lost territory Montgomery lost to Clinton, Essex, Saratoga, and Washington.
to Clinton to Essex to Saratoga to Washington
3 April 1801 · N.Y. Laws 1801, 24th sess., ch. 123/p. 290
1816
Lost territory Montgomery lost to creation of Hamilton; Hamilton not fully organized, attached to Montgomery for administrative and judicial purposes.
to Hamilton
12 April 1816 · N.Y. Laws 1816, 39th sess., ch. 120, sec. 1/p. 119
1817
Lost territory Montgomery lost to Herkimer.
to Herkimer
2 May 1817 · N.Y. Laws 1816, 40th sess., ch. 184/p. 182
1838
Changed Hamilton was partially organized, detached from Montgomery.
Hamilton
1 January 1838 · N.Y. Laws 1837, 60th sess., ch. 238, sec. 1/p. 227
1838
Lost territory Montgomery lost to creation of Fulton.
to Fulton
18 April 1838 · N.Y. Laws 1838, 61st sess., ch. 332, sec. 1/p. 328

Land and parcels

What the maps cover in Montgomery

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

Parcels Good enough

Lot lines and tax-map numbers for 25,260 parcels from New York State Geographic Information Systems (GIS) Clearinghouse. Drawn for tax purposes: usually within a few feet of a survey, but not a survey.
edited 25 September 2026 · checked 15 October 2026
Address points Official

One point per address, 26,421 in all from NYS Office of Information Technology Services (ITS), Geospatial Services / GIS Program Office (AGOL org 'ShareGIS NY', owner NYSGIS_GPO).
edited 25 September 2026 · checked 14 October 2026
Buildings Reference

Roof outlines traced from aerial imagery from FEMA Response Geospatial Office with Oak Ridge National Laboratory (ORNL). Good for seeing what is on a lot; not accurate enough to set a fence from.
checked 18 October 2026

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

Montgomery by the Census

Population

49,532 2020 Census count

Housing units

22,857 2020 Census count

Land area

403 square miles

Water area

7.2 square miles

People per sq mi

123 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

Montgomery County's official site

We have found the county's site but not its offices yet; start there.

County government

County government
The official website of Montgomery County.
co.montgomery.ny.us

See your own lot on these maps

Open Montgomery 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.

Open the free map no sign-in Pro early access

Questions

Common questions about Montgomery County

When was Montgomery County founded?: Montgomery County was founded in 1772, formed from Albany County, and named after Richard Montgomery.
What is the county seat of Montgomery County?: The county seat of Montgomery County is Fonda.
Is there an online parcel map for Montgomery County?: Yes. New York State Geographic Information Systems (GIS) Clearinghouse publishes a parcel map of 25,260 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Montgomery County's boundary or name changed?: Montgomery County was created in 1772 from Albany County. Since then the Atlas of Historical County Boundaries records 9 later changes, chiefly involving Herkimer County, Hamilton County and Clinton County. It was formerly called Tryon.
Is my lot in a flood zone?: We do not have flood maps for Montgomery County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

Nearby