County · code 36043
Herkimer CountyNew York
Herkimer County is in New York and was created on February 16, 1791, from Montgomery County. The county seat is Herkimer.
- Founded1791
- County seatHerkimer
- Named forNicholas Herkimer
- Land area1,412 sq mi + 46 sq mi water
- Population60,139 2020 Census
Where it is
Herkimer 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.
History
Formed in 1791 from Montgomery County
An old deed may name a county that no longer exists, or a boundary that has since moved.
Herkimer County was named after Nicholas Herkimer. Since its creation, the county has changed shape through multiple boundary adjustments: it lost territory to the creation of Onondaga in 1794, to Montgomery in 1797, to the creation of Chenango and Oneida in 1798, and to Clinton in 1801, while gaining land from Otsego in 1816 and from Montgomery in 1817.
- 1791Herkimer County created Herkimer created from Montgomery. · N.Y. Laws 1791, 14th sess., ch. 10/p. 206
- 1794Lost territory Herkimer lost to creation of Onondaga. · N.Y. Laws 1794, 17th sess., ch. 18/p. 491
- 1797Lost territory Herkimer lost to Montgomery. · N.Y. Laws 1797, 20th sess., ch. 74/p. 100
- 1798Lost territory Herkimer lost to creation of Chenango and Oneida. · N.Y. Laws 1798, 21st sess., ch. 31/p. 170
- 1801
- 1816Gained territory Herkimer gained from Otsego. · N.Y. Laws 1816, 39th sess., ch. 222/p. 270
- 1817Gained territory Herkimer gained from Montgomery. · N.Y. Laws 1816, 40th sess., ch. 184/p. 182
Land and parcels
What the maps cover in Herkimer
Who publishes each layer, how good it is, and when we last checked.
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Parcels Missing
No public parcel map found for Herkimer County yet. Lot lines and owners of record are kept by the county (herkimercounty.org).
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Address points Official
One point per address, 41,378 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
Herkimer by the Census
Source: US Census Bureau, 2020 Census; US Census Bureau, 2020 Gazetteer Files. Not endorsed or certified by the Census Bureau.
Rules and offices
Herkimer 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 Herkimer County.
See your own lot on these maps
Open Herkimer 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.
Questions
Common questions about Herkimer County
- When was Herkimer County founded?
- Herkimer County was founded in 1791, formed from Montgomery County, and named after Nicholas Herkimer.
- What is the county seat of Herkimer County?
- The county seat of Herkimer County is Herkimer.
- Is there an online parcel map for Herkimer 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 Herkimer County's boundary or name changed?
- Herkimer County was created in 1791 from Montgomery County. Since then the Atlas of Historical County Boundaries records 6 later changes, chiefly involving Montgomery County, Chenango County and Clinton County.
- Is my lot in a flood zone?
- We do not have flood maps for Herkimer County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.
Nearby