County · code 25019
Nantucket CountyMassachusetts
Nantucket County is a county in Massachusetts with its seat in Nantucket. It was created on June 22, 1695.
- Founded1695
- County seatNantucket
- Named forNantucket, Massachusetts
- Land area46 sq mi + 257 sq mi water
- Population14,255 2020 Census
- Parcels mapped13,904 checked 15 October 2026
Where it is
Nantucket on the map of Massachusetts
Massachusetts has 14 counties and county equivalents, each with its own records office. Shapes with a page are links.
History
Founded in 1695
An old deed may name a county that no longer exists, or a boundary that has since moved.
Nantucket County was created on June 22, 1695, from non-county area in Massachusetts Bay Colony on Nantucket Island.
- 1695Nantucket County created Nantucket created from non-county area in Massachusetts Bay Colony (Nantucket Island). · Mass. Col. Acts, vol. 1, ch. 7 [1695-1696]/p. 216
Land and parcels
What the maps cover in Nantucket
Who publishes each layer, how good it is, and when we last checked.
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Parcels Good enough
Lot lines and tax-map numbers for 13,904 parcels from MassGIS (Bureau of Geographic Information), Commonwealth of Massachusetts. Drawn for tax purposes: usually within a few feet of a survey, but not a survey.
checked 15 October 2026 -
Address points Official
One point per address, 13,504 in all from MassGIS.
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
Nantucket 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
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.
In Massachusetts, permits, zoning and assessing are handled by each city or town, not the county, and deeds are recorded at the county's registry of deeds (search the registries).
Records
Permits
- Health department: septic and well
Behavioral Health Directory
- Permits
- Food Permits and Applications
- Septic
- Private Wells
GIS and maps
County government
- County government
The official website of Nantucket County.
See your own lot on these maps
Open Nantucket 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 Nantucket County
- When was Nantucket County founded?
- Nantucket County was founded in 1695, and named after Nantucket, Massachusetts.
- What is the county seat of Nantucket County?
- The county seat of Nantucket County is Nantucket.
- Is there an online parcel map for Nantucket County?
- Yes. MassGIS (Bureau of Geographic Information), Commonwealth of Massachusetts publishes a parcel map of 13,904 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
- Has Nantucket County's boundary or name changed?
- Nantucket County was created in 1695. The Atlas of Historical County Boundaries records no boundary change since.
- Who issues building permits in Nantucket County?
- The county's page on building permits: Permits. Inside a city or town, ask that city first.
- Who issues septic and well permits in Nantucket County?
- The county's page on septic systems and wells: Behavioral Health Directory.
- Is my lot in a flood zone?
- We do not have flood maps for Nantucket County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.
Nearby