Cook County Parcel Sales - Buyer & Seller Names

Cook County Parcel Owners - Names & Mailing Addresses

j0401/cook-parcel-owners

Cook County Assessor parcel address file (public open data, 1.86M parcels per roll, 1999-2026): the owner of record AND the taxpayer of record, each with its full mailing address - they differ on 32.9% of parcels. Search by owner, taxpayer, city, ZIP or mailing state; find absentee owners.

Cook County Assessment Appeals - Values & Board Decisions

j0401/cook-assessment-appeals

Cook County assessment records keyed on one parcel id (public open data, 59.8M rows): a parcel's value as mailed, certified and Board-revised; every appeal case with type, status and reasons; and Board of Review decisions showing the Assessor's value against the Board's and the outcome.

NY Property Assessments - Parcels, Owners & 5-Year Value Trail

j0401/ny-property-assessments

New York property assessment rolls (public open data, 23.6M records, 2021-2025): every parcel with its owner, mailing address, exemptions and six value columns - plus each parcel's exact year-over-year value movement. Excludes New York City, which files separately.

DC Building Permits - 2009 to Present

j0401/dc-building-permits

Washington DC building permits (public open data, year layers 2009-2026): type/subtype/category, status, work description, applicant and owner, fees, address with ward/ANC/SMD, zoning and the SSL parcel key that joins to DC property records.

Maryland Property Assessments - Values, Structure & Sales

j0401/md-property-assessments

All 2.44M Maryland real-property assessment accounts (public open data, 24 jurisdictions): assessment values, land/improvement split, CAMA structure (year built, sq ft, units, grade, type), last recorded sale with seller name, exemptions, homestead. Search by county, city, ZIP, address or sale date.

NYC Property Valuation - Assessment & 5-Year Value Trail

j0401/nyc-property-valuation

New York City property assessment records (public open data, 11.7M rows, 2023-2027): every parcel's owner and address, its value through five assessment stages, and the year-over-year movement in market and assessed value.

DC DDOT TOPS Permits - Construction & Occupancy

j0401/dc-tops-permits

Washington DC DDOT right-of-way permits (public open data): 543k construction permits and 983k occupancy permits, 2005-present. Fees broken out by kind, three named parties, ward/ANC/SMD/ZIP, district overlays and pre-computed cycle times. Search by address, owner, permittee, ward or status.

Look up land parcel records by address, assessor parcel number, owner name, coordinate or map polygon, and read the full record: boundary geometry, owner and mailing address, zoning and land use, acreage, assessed value, sale history and flood zone. Bring your own key.

MD PG County Tax-Sale Foreclosures

j0401/md-pg-foreclosures

Prince George's County, MD tax-sale foreclosure register (~78.7k, 2009-present, open data): every property submitted for county tax sale - tax account, property id, submission date, address, occupied flag. Distressed-property diligence: an address's full history or a fresh-submission sweep.

Cook County Assessor open data as clean JSON: parcel sales with buyer, seller, price and deed type; assessed values (mailed, certified, Board of Review); building permits; assessment appeals with agent and outcome. Filter by date, township, class, price, PIN list and buyer or seller name.