Nantucket County, Massachusetts property research

Imported March 1, 2026. Assessment fiscal year is retained per record; this is not a current title or listing feed.

Attribution: MassGIS (Bureau of Geographic Information), Commonwealth of Massachusetts EOTSS; Town of Nantucket assessors
Source: https://www.mass.gov/info-details/massgis-data-property-tax-parcels
Reuse: MassGIS states that its publicly funded data are in the public domain and may be used for any purpose.
https://www.mass.gov/info-details/massgis-frequently-asked-questions

These are dated research files, curated from public source facts. Ownership is an assessor entry, not verified legal title or a statement that a property is for sale. Source and import dates differ; September 2026 enrichment does not refresh the underlying assessment or ownership record.

GEOGRAPHY: Every retained valid parcel's representative point is tested against the official Census ACS 2024 county boundary with a 100-meter boundary tolerance. Geometry is preserved when valid; invalid geometry receives null analytical results. Parcel record count describes the imported selection, not a guarantee of all current parcels. Distinct identifiers are retained even when geometries overlap (for example condominium interests).

FLOOD: Full valid parcel polygons intersect official FEMA NFHL flood-hazard polygons. Union areas avoid double counting; intersections smaller than one square meter are omitted. Percentages use the full parcel area as denominator, with coverage recorded separately. Special Flood Hazard Area means SFHA_TF=T. Coverage below 99.9% leaves an unknown remainder, not a negative flood finding. Zone X and zero mapped SFHA do not certify freedom from flooding. This is screening data, not a flood certificate, survey, insurance recommendation or engineering opinion.

SCHOOLS: NCES 2024-25 physical active public-school points and Census ACS 2024 unified-school districts. Nearest school is shortest parcel-to-point straight-line distance among retrieved physical schools in the state. It does not determine attendance eligibility, walking distance or school quality. Verify enrollment with the district.

ZONING: Where present, zoning is copied from an original assessor attribute. No contemporary zoning-polygon overlay or permitted-use verification is performed for these two packs. Blank means unavailable. Land use is the original tax classification, not a permitted-use conclusion. Utility service/capacity, development approval, road access, title and survey boundaries are not established by these files.

DATA HANDLING: Zero remains distinct from missing. Blank, UNKNOWN and punctuation-only address placeholders become null. Original source field names and dates are documented. Texas date_acq is acquisition date, NEVER treated as sale date. Invalid source parcel geometry is not silently repaired; invalid overlay geometries may be repaired for intersection and counts are documented. Owner names and public tax mailing addresses only; no personal phone/email enrichment or demographic profiling.

USAGE: Paid curation of nonexclusive public facts; internal business and client work are allowed. Attribution is retained. LandSight claims no exclusive rights to government facts. Seven-day correction/refund policy if delivered files fail their stated scope: dakota@landsightsolutions.com.

Projection for measured areas/distances: EPSG:26919