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King County parcel data with real year-built, the Recorder's LandmarkWeb deed search, the Seattle Public Library and Puget Sound Regional Archives, Sanborn maps, and the census — how to trace a Seattle house from a Ballard bungalow to a Capitol Hill foursquare.
May 30, 2026 · 4 min read
OpenDataPhilly's parcel data, the Department of Records deed search, the Free Library and the Philadelphia City Archives, the famous Hexamer insurance surveys, Sanborn maps, and the census — how to trace a Philadelphia rowhouse back to the colonial grid.
May 29, 2026 · 4 min read
Denver's combined city-and-county assessor and Clerk & Recorder, the Denver Public Library's Western History collection, Sanborn maps, the census, and the subdivision plats that built the streetcar suburbs — a practical guide to tracing a Denver house.
May 28, 2026 · 4 min read
Fulton County parcel data, Georgia's statewide GSCCCA deed index, the Atlanta History Center and the Kenan Research Center, Sanborn maps, the census, and the deed restrictions that shaped a segregated city — how to trace an Atlanta house.
May 27, 2026 · 4 min read
The Cook County recorder for deeds, the city's building-footprint open data for year-built and units, Chicago's deep newspaper archives, and Sanborn fire-insurance maps — a practical guide to tracing a Chicago house.
May 26, 2026 · 3 min read
The District's combined assessment and Recorder of Deeds, the building permit database, the DC History Center and the Washingtoniana collection, Baist's real-estate atlases, Sanborn maps, and the census — a guide to tracing a DC rowhouse.
May 26, 2026 · 4 min read
The LA County Assessor parcel record, the Registrar-Recorder for deeds, Sanborn maps, the Los Angeles Public Library photo and map collections, and building permits — how to trace the history of an LA house.
May 25, 2026 · 4 min read
The Suffolk Registry of Deeds and statewide masslandrecords.com, the City of Boston assessing data, the Boston Public Library's superb map collection, and Sanborn maps — how to trace a Boston house back to the beginning.
May 24, 2026 · 4 min read
Drawn to help insurers price risk, the Sanborn maps accidentally recorded American cities building by building — material, height, use, footprint — across decades. Here's what they are, how to read the colors, and where to find them free.
May 22, 2026 · 3 min read
The Harris County Appraisal District parcel record, the Harris County Clerk for deeds, the Houston Metropolitan Research Center, Sanborn maps, and the census — a practical guide to tracing a Houston house.
May 21, 2026 · 4 min read