How to research a house in Denver
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.
By The Plot Team · May 28, 2026 · 4 min read
Denver boomed with silver and the railroads, and its older neighborhoods — the Victorians of Capitol Hill and Five Points, the Denver Squares of Washington Park, the bungalows of Park Hill and Berkeley — carry that history in their deeds and their masonry. Denver is a consolidated city and county, which keeps the research tidy. Here's the path.
Start with the parcel: the Denver assessor
Because Denver is both a city and a county, the Office of the Assessor is your single anchor. Its public parcel data — keyed to a schedule number — carries the situs address, the year built, the property type, and characteristics, searchable through the city's Real Property and Assessment lookups and published in Denver's open GIS layers. That open parcel layer is the free, automatable tier and the one Plot reads where Denver is covered. Treat an early year-built as a strong hint and confirm it against the Sanborn sheets.
Trace ownership: the Clerk & Recorder
Deeds are recorded by the Denver Clerk and Recorder, whose real-estate records search offers a free index online with image fees for copies; the online index runs robustly from about 1990 forward, with older instruments available through the office and the archives. Like every county recorder outside NYC, it's a search-and-order portal, not a bulk feed. Search by name or by legal description and read the chain oldest-first.
See the block: Sanborn maps
The Sanborn fire-insurance maps cover Denver and are free through the Library of Congress. They show your block footprint by footprint, color-coded by material, across editions from the 1880s into the mid-20th century — perfect for dating when a prairie block filled in with frame cottages or brick squares. The Denver Public Library holds additional Sanborn sheets and historical maps.
The Denver Public Library's Western History collection
Denver's secret weapon is the Denver Public Library's Western History and Genealogy Department — one of the great regional history collections in the West. It holds an enormous digitized photograph collection (searchable, and rich in street and building scenes), city directories, neighborhood files, and manuscript collections. For a Denver house, this is where the imagery and the people come alive. The History Colorado center adds statewide records and the National Register files.
Find the people: census and directories
The federal census (public 1850–1950) names everyone in the household with ages, occupations, and birthplaces. Denver's Ballenger & Richards / city directories, many digitized on the Internet Archive and held at the Denver Public Library, fill the years between counts and let you track residents by name. Search newspapers through Chronicling America (Library of Congress), which carries historical Denver and Colorado titles free.
A Denver specialty: the subdivision plats and the streetcar suburbs
Denver grew subdivision by subdivision along its streetcar lines in the 1880s–1920s, and the plat is the document that records it. Recorded with the Clerk & Recorder and named — "Capitol Hill," "Wyman's Addition," "Berkeley," "Park Hill" — a plat shows when a developer carved a parcel into numbered lots, and your deed's legal description names the plat and lot. Follow the plat and you'll usually pin the year your street was born. As with much of the country, read the older chain with care: into the mid-20th century some Denver subdivisions carried racial covenants, now void but still present in the recorded record — part of the city's honest history.
Landmark status
Check whether your house is a designated Denver Landmark or sits in a Denver historic district (the city's Landmark Preservation office keeps the list and publishes designation reports) or is on the National Register. Denver has many landmark districts; their designation documents often contain a ready-made architectural and development history of the block.
Let Plot assemble the Denver record
Plot resolves a Denver address against the city-and-county assessor's parcel data and the broad public record automatically — the year built, the lot, the press, archival imagery — and writes a cited history. For the deed chain, Plot points you to the Denver Clerk & Recorder's real-estate search (free index, copies for the rest) while it gathers the parcel facts, press, maps, and imagery for you.