NANTUCKET COUNTY, MASSACHUSETTS · FY2024 ASSESSMENT SNAPSHOT
Nantucket County, Massachusetts property data
13,801 parcel records across the represented property classes and sizes. Recorded owner and property fields, enriched with FEMA flood mapping and school context. CSV + GeoJSON.
$9 one time
FY2024 assessment snapshot. Imported March 2026; mapping enrichment September 22, 2026. The newer overlays do not refresh older ownership or assessment records.
CHECK THE FILE FIRST
Real records. Measured coverage.
13,801 records · 13,325 with owner names · 13,321 with tax mailing addresses.
13,793 valid geometries · 13,773 with at least 99.9% FEMA coverage · 13,793 with school context.
Download the free CSV sample Full coverage details
Across the full download: 2,643 parcels intersect a mapped high-risk flood area; 11 have unknown SFHA overlap. These five sample rows do not represent the full range of flood results.
Reading the flood fields: Mapped coverage is the share of the parcel covered by FEMA zone polygons; 100% coverage does not mean 100% high-risk flood area. SFHA overlap is the share in FEMA's mapped high-risk area (the 1%-annual-chance floodplain). Zone X can have different subtypes, shown when supplied. Missing mapping stays unknown; partial mapping leaves part of the parcel unassessed. A 0% SFHA overlap is not a guarantee against flooding. FEMA flood-hazard layer.
| Parcel / owner | Mapped acres / site | FEMA zone / subtype | High-risk overlap / mapping | School district |
|---|---|---|---|---|
| F_1000059_2574344LAFARGE TUCKERNUCK TRUST | 55.492TUCKERNUCK | Zone AE; VE; X0.2 PCT ANNUAL CHANCE FLOOD HAZARD; AREA OF MINIMAL FLOOD HAZARDFEMA source layer | SFHA: 55.013%Mapped coverage: 100%Mapping covers ≥99.9% | Nantucket School District |
| F_1000297_2570231TUCKERNUCK ASSOCIATES | 3.066TUCKERNUCK | Zone VE; XAREA OF MINIMAL FLOOD HAZARDFEMA source layer | SFHA: 10.983%Mapped coverage: 100%Mapping covers ≥99.9% | Nantucket School District |
| F_1000328_2570741CONGDON WILLIAM ETAL TRS | 3.032TUCKERNUCK | Zone XAREA OF MINIMAL FLOOD HAZARDFEMA source layer | SFHA: 0%Mapped coverage: 100%Mapping covers ≥99.9% | Nantucket School District |
| F_1000353_2571219SOUZA SHIRLEY & MANUAL F III | 2.918TUCKERNUCK | Zone XAREA OF MINIMAL FLOOD HAZARDFEMA source layer | SFHA: 0%Mapped coverage: 100%Mapping covers ≥99.9% | Nantucket School District |
| F_1000375_2571671MCGRATH WILLIAM F TRUSTEE | 2.976TUCKERNUCK | Zone XAREA OF MINIMAL FLOOD HAZARDFEMA source layer | SFHA: 0%Mapped coverage: 100%Mapping covers ≥99.9% | Nantucket School District |
Actual sample rows. Missing values are not inferred. Recorded owners are not verified title or an indication that the property is for sale.
IN YOUR DOWNLOAD
64 fields, with source notes.
CSV and matching GeoJSON, per-parcel enrichment evidence, coverage counts, provenance and methodology. Owner names, available tax mailing and property attributes, full-polygon FEMA overlays, school districts and nearest mapped active public-school distances. School virtual-status flags are preserved; a missing flag does not verify a physical campus.
13,295 records carry assessor zoning attributes. These are source attributes, not a current zoning overlay.
Each retained valid parcel representative point was checked against the Census county boundary with a 100-meter tolerance. Unrecoverable geometries remain null for spatial analysis. Where an import repeated an identical polygon ring, an explicitly recorded duplicate-ring recovery is documented in the methodology and evidence. This dated imported selection is not certified as the entire current assessor roll.
Read methodology and source conditions · View provenance
Dates and interpretation
Flood mapping does not certify absence of flooding. Nearest schools do not establish attendance. This research does not establish title, access, utilities, approved uses, vacancy, listing availability, project feasibility or investment results.
FROM DATA TO YOUR SHORTLIST
Compare the parcels that fit your research.
Filter parcel size, flood context and wetland mapping, then export matching records with their source dates and evidence links. The included tool runs locally with your full county CSV.
Try the shortlist tool with real samples
NWI wetland and water mapping: 2,605 records intersect mapped NWI features; 13,793 have at least 99.9% digital project footprint coverage. Per-parcel overlap, habitat types, imagery years and evidence are included.
NWI uses biological definitions and does not establish regulatory jurisdiction or wetland absence. Imagery dates vary; newer overlays do not refresh the property snapshot. Mapped acres outside SFHA are not buildable acreage.
TURN RECORD CHANGES INTO A REVIEW QUEUE
See which assessment records need another look.
Dated assessment update review: an additional official MassGIS selection of 14,573 records, including 14,357 FY2026 assessments, is included with this pack. The comparison links 13,156 original records by a unique exact source key; unresolved matches remain separate.
1,877 matched records have owner-name text changes and 2,362 have mailing-field text changes. Use the side-by-side CSV to prioritize verification, reconcile a research list or investigate a source discrepancy. Changes are review signals, not confirmed sales or ownership transfers.
Included: complete dated assessment CSV/GeoJSON, comparison CSV, unmatched-record queue and source/coverage notes. The 13,801-record original research file remains included with its existing flood and wetland mapping.
Download the comparison sample View matching and coverage
Retrieved 2026-09-23; assessment years vary by record. Existing spatial analysis applies to original geometry. New boundaries have not been re-screened. Source names and mailing addresses are not current title or deliverability verification.
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Nantucket property research, ready to download.
13,801 records, fy2024 assessment snapshot, with September 2026 mapped context. Review sample and dates before purchase. No subscription.
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Check the sample, source dates, included fields, and coverage notes above. Keep unknown values and review flags with your shortlist.