How to Research the History of Your Portland House

Oct 18

Researching your Portland house at a glance

Start with PortlandMaps for the year built and scanned historic permits. Then find your pre-1933 address, check the Oregon Historic Sites Database and NPGallery for a survey form or National Register nomination, and use Multnomah County Library city directories, Sanborn maps and the Historical Oregonian to learn who lived there and when.

Portland · Field Notes

From permit cards to Sanborn maps, the records that show who built your Portland house and who lived there.

By Debbie Pisaro · October 18, 2026

PortlandMaps

Step one: start with PortlandMaps

PortlandMaps is the City of Portland's property search, and every house history guide reviewed for this page sends you there first. Type in your address and the property page shows basic statistics along with historic details, including a year of construction. The year is a starting point, not a final answer. Treat it as a clue to test against other records.

The more useful part is the permit history. When records exist, a "Historic Permits" link appears on the property page, and it opens scanned permit cards and applications. One local guide suggests looking for the historic plumbing permits in particular. The earliest plumbing permit is often the closest thing to a birth certificate for an older house: depending on the age and type of building, it can show the last name of the owner who applied and the date the plumbing was signed off. Later permits trace additions and remodels.

The City's public records page says plans and applications for permits issued from June 1, 2012, through December 2023 are on PortlandMaps for free, and that most documents for newer permits need a public records request. If something you expect is missing, Portland Permitting & Development's public records process is the next step, and fees may apply for complex permit histories. Confirm the current rules with the city before you file.

PortlandMaps also carries the city's historic resource map layers. One combined layer shows historic and conservation district boundaries along with landmark building footprints. A separate layer shows the 1984 Historic Resource Inventory. Checking both tells you quickly whether your house is a designated landmark, sits inside a historic district, or was simply noted in the 1984 survey.

Old addresses

Step two: find the address your house had before 1933

If your house was built before the early 1930s, its first address was almost certainly different from the one on your mailbox. Portland adopted a renumbering plan in 1931 under city engineer Olaf Laurgaard, and crews walked the city assigning new numbers to every building, finishing in July 1933. That project, which local historians call the Great Renumbering, also created the quadrant system of NW, N, NE, SW and SE. Some streets were renamed at the same time. A Concordia example shows Vernon Avenue becoming today's NE 14th Place under a rule that streets between consecutively numbered avenues take a number and the word "Place."

The standard conversion tool is the Directory of Street and Name Changes published by the Crane Direct Mail Service. Multnomah County Library notes that it is designed to convert old addresses to new ones but works in both directions. You can use it at Central Library, and the library says a digital copy is available from the City Archives. Sanborn fire insurance maps are another way to find the original number, since they show house numbers on each lot.

Write down every address the house has had. Some houses were renumbered more than once as nearby lots filled in, so an old directory listing under one number and a later listing under another can both be right. Every search that follows, from city directories to newspaper archives, works better when you search the old address too.

Surveys and listings

Step three: check whether your house was surveyed or listed

Next, find out whether someone has already researched your house.

The Oregon Historic Sites Database

Run by the State Historic Preservation Office (SHPO), the Oregon Historic Sites Database holds properties SHPO has inventoried and properties listed in the National Register of Historic Places. A SHPO announcement described it as including PDFs of National Register nominations and inventory forms for nearly 30,000 properties surveyed since the late 1960s. Records range from a line or two to extensive physical and historical information. You can search by address or property name, or filter by survey group. Being in the database is not a designation, and some material exists only in SHPO's paper files, so contact SHPO if the online record is thin.

The Historic Resource Inventory (1984)

Portland's Bureau of Planning surveyed historic resources citywide with SHPO grant funding, and the Historic Landmarks Commission adopted an inventory of about 5,000 properties in 1984. Properties were ranked Class I, II or III by significance, and the inventory also recorded "unranked" properties considered interesting but not significant. City documents say listing in the inventory is not a designation, though a demolition delay may apply, and that the inventory has not been updated since 1984. A copy is held at Multnomah County Library and at the Oregon Historical Society Research Library, and the property-level data appears as a PortlandMaps layer, where the city notes it may contain errors.

National Register nominations on NPGallery

The National Park Service's NPGallery hosts scanned nomination forms, photographs and listing records for many National Register properties. Search by the historic name of the house or by its reference number, which you can find on the SHPO record. If your house is in a listed historic district, look for the district nomination too: it usually includes a property-by-property inventory with a short entry for each house.

A listing also matters for what you can change. Under Portland's zoning code (Chapter 33.445), a property listed in the National Register on or before January 27, 2017, is identified as a Historic Landmark, and Historic Landmarks and properties in historic districts go through Historic Resource Review for exterior alterations, additions and new construction. Portland Permitting & Development runs those reviews. Confirm how the rules apply to your property with the city before planning work.

Portland and California

Moving between Portland and California? Debbie Pisaro of Coastline 840 handles the California side of that move.

Call (310) 362-6429

Reading a nomination

How to read a National Register nomination

A nomination is often the richest single document an old house has. The form follows a standard National Park Service structure, so once you have read one you can find your way around any of them.

Section 7, the description. It opens with a summary paragraph covering location, type, style, construction, setting, size and notable features, then walks through the exterior and interior. It also says whether the house keeps its historic integrity and notes alterations.
Section 8, the statement of significance. This section marks which National Register criteria apply, gives a period of significance, and explains why the house matters. The house nominations reviewed for this page were listed for architecture, which falls under Criterion C, the criterion for design or the work of a master. Look here for the original owners, the architect, the builder and the story of the commission.
The sources and the photos. The author's list of sources is a ready-made research trail: directories, permits, newspaper articles and architects' records you can go back and check. The photographs show the house as it looked when nominated.

The houses already covered on Just Portland show what a nomination can reveal. The Cora Bryant Wheeler House nomination records that A. E. Doyle insisted on building directly on the natural point of the ridge in Portland Heights, though Cora Wheeler had wanted the house set further back, and that Pietro Belluschi and Richard Sundeleaf supervised construction. The James Hickey House nomination explains that Ellis F. Lawrence designed it for a building contractor as a model home in Eastmoreland, and lists details down to the rounded door and window openings and the wrought iron stair railing. The Bertha M. and Marie A. Green House nomination places the 1937 house in the Georgian Court Plat and reads Wade Hampton Pipes's design as a modernistic Georgian with influences from C.F.A. Voysey. The Coleman-Scott House nomination names Leslie M. Scott as a significant person and notes that Irvington was limited to one house per 50-foot lot with a minimum building cost. The Edward H. and Bertha R. Keller House nomination calls it the most notable of Elmer Feig's few known single-family commissions.

Older nominations were typed and scanned, so the searchable text can be garbled. Read the PDF images rather than relying on the text layer, and treat any date or name as something to confirm with a second source.

Past residents

Step four: learn who lived there

City directories are the backbone of finding past residents. Multnomah County Library calls them great tools for finding who lived at a specific address, and historic Portland directories list people and businesses within city limits when each edition was published. Many directories, such as the Polk directories, include a section arranged by street address, which lets you look up the house and see the name and often the occupation of the head of household year by year. A change of name usually means a sale or a new tenant.

The library holds print and microform directories and offers electronic copies through Ancestry Library Edition in its database list. The Oregon Historical Society Research Library and the Genealogical Forum of Oregon also hold Portland directories. Once you have a name, census records fill in the rest of the household: spouses, children, boarders and servants.

Newspapers bring the people to life. With a Multnomah County Library card you can search the Historical Oregonian (1861 to 1987) and the Oregon Journal (1902 to 1982). Search the current address, every old address and every owner's name. The library says people who live, own property, teach or go to school in Multnomah County and several surrounding counties can register for a card. For other Oregon papers, the University of Oregon Libraries' Historic Oregon Newspapers site is free and full-text searchable, with most of its online pages from 1922 and earlier.

Maps and plats

Step five: read the maps and the plat

Sanborn fire insurance maps were drawn block by block for insurance underwriters and show the footprint of each building, its construction material, porches, outbuildings and house numbers. Comparing editions shows when your house first appeared and how its footprint changed. Major Portland editions were published in 1879, 1889, 1901, 1908 to 1909 and 1924 to 1928, and sheet numbers often changed between editions, so expect to hunt. Multnomah County Library cardholders can use Digital Sanborn Maps 1867 to 1970 from home.

Your neighborhood began as a platted addition, a tract of land divided into lots and blocks and filed with the county, and the addition's name still appears in your property's legal description. Multnomah County's Survey and Assessment Image Locator, called SAIL, includes recorded plats, surveys and assessment maps. You can search by address, plat name or tax lot, or zoom into the map until subdivision boundaries appear. A Restore Oregon guide notes that the original plat shows who owned the land when it was divided, when the plat was submitted and when the county approved it. The Oregon Secretary of State's records guide says SAIL's information dates from about 1851 to the present. Developers sometimes attached deed restrictions to an addition, such as the Irvington lot and building cost rules noted in the Coleman-Scott House nomination, and those rules often explain why a street looks the way it does.

Ownership

Step six: trace the chain of ownership

Directories tell you who lived in a house; deeds tell you who owned it. Multnomah County's Division of Assessment, Recording and Taxation keeps tax rolls and tax lot ownership history. Its online systems include MultCoPropTax, for property, land, building and tax information, and MultCoRecords, which holds recorded documents from February 2002 forward, searchable by name, date and document type.

For anything older, the county says it keeps microform property records and recordings that predate the websites. You can use them, and the online systems, free at the customer service counter in the Multnomah Building at 501 SE Hawthorne Boulevard. Work backward from your own deed: each deed names the seller, who became the buyer on the deed before, until you reach the developer of the addition. Fees for copies and the counter's hours can change, so confirm with the county before you go.

Multnomah County's house history page also points out that block books, historic volumes arranged by block and lot, are held at the Oregon Historical Society Research Library and can help bridge gaps in the ownership chain.

Step seven: visit the archives and libraries

Several Portland institutions hold material you will not find online. Contact each before you visit.

City of Portland Archives and Records Center

The Portland Archives and Records Center, run by the City Auditor, is on the Portland State University campus at 1800 SW 6th Avenue, Suite 550. In-person research is by appointment. You do not need to file a public records request to use records there, and the city encourages researchers to photograph records with their own phones or cameras. The archives' guide to building research says there is no single source for building information and points to its photographs, maps and plans. Its online catalog, Efiles, lists the collection and includes many scanned images and documents you can view from home.

Oregon Historical Society Research Library

The Oregon Historical Society Research Library, at 1200 SW Park Avenue, holds a copy of the 1984 Historic Resource Inventory, block books, Portland city directories, Sanborn maps and historic photographs. Its architecture collection includes building brochures and sample house plans, and some houses have their own small photograph collections. Search the catalog by address, owner and architect, and contact the reference desk about access before you go.

Architectural Heritage Center

The Architectural Heritage Center, at 701 SE Grand Avenue, keeps a library for anyone interested in historic preservation and architecture, along with one of the largest collections of salvaged building pieces in the western United States. It offers members a four-part online series on researching the history of a home or other building in the Portland area.

Oregon Digital

Oregon Digital, run by the University of Oregon Libraries and Oregon State University Libraries and Press, hosts the Building Oregon collection, more than 23,000 items documenting the architecture of the Pacific Northwest. It includes SHPO photographs taken for National Register nominations, so you may find the nomination photos of a listed house here in better quality than the scanned PDF. Check each item's rights statement before reusing an image.

Multnomah County Library's reference staff can also help you plan a search in person or through its Book a Librarian service. Expect gaps along the way. Every guide reviewed for this page warns that house records are scattered and sometimes missing, especially photographs, and a good house history is usually built from many small finds rather than one perfect document.

Frequently asked questions

Where do I start?

Start with PortlandMaps. Search your address and look for the year of construction and the "Historic Permits" link, which opens scanned permit cards when they exist. The earliest plumbing permit often names the original owner and gives a date. From there, find any older address and check the Oregon Historic Sites Database.

Why can't directories find my house?

Your house probably had a different address before 1933. Portland renumbered every building between 1931 and July 1933 and created the quadrant system. Use the Directory of Street and Name Changes at Central Library, or a Sanborn map, to find the old number, then search directories under both addresses.

How do I find out if my house is on the National Register?

Search the Oregon Historic Sites Database, run by the State Historic Preservation Office, or check the historic resource layers on PortlandMaps. If your house is listed, its nomination form is usually on the National Park Service's NPGallery. Houses inside a listed historic district appear in the district nomination's inventory.

What is the Historic Resource Inventory and is my house in it?

It is a citywide survey of about 5,000 properties adopted in 1984, ranked Class I, II or III by significance. Listing is not a designation, though a demolition delay may apply. Check the inventory layer on PortlandMaps, or the copies at Multnomah County Library and the Oregon Historical Society Research Library.

What does a nomination tell me?

A nomination describes the house inside and out in Section 7 and explains why it matters in Section 8, often naming the original owners, architect and builder. It notes alterations, includes photographs and lists the author's sources. Older forms are scanned typescripts, so read the PDF images and confirm key facts elsewhere.

Can I see Sanborn maps online?

Yes, with a Multnomah County Library card. The library's Digital Sanborn Maps 1867 to 1970 database covers Portland and hundreds of other Oregon towns. Major Portland editions date from 1879, 1889, 1901, 1908 to 1909 and 1924 to 1928, and sheet numbers often change between editions, so check the index for each year.

How do I trace every owner of my house back in time?

Work backward through deeds. MultCoRecords covers recorded documents from February 2002 forward, and older recordings are on microform at the county counter in the Multnomah Building, 501 SE Hawthorne Boulevard. Each deed names the prior owner, so you can step back sale by sale to the addition's original plat.

Is the City Archives appointment only?

Yes. In-person research at the Portland Archives and Records Center, 1800 SW 6th Avenue, Suite 550, is by appointment, and the city lists a phone number and email for booking. You do not need a public records request to view records there, and you may photograph them with your own device.

Can a California real estate agent help with a move between Portland and California?

Yes, on the California side. Debbie Pisaro is a California real estate agent, DRE #01369110, and handles the buying or selling that happens in California. She is not licensed in Oregon, so the Portland side of a move needs an Oregon-licensed agent. Call (310) 362-6429 or email debbie@coastline840.com.

Portland and California

Moving between Portland and California?

Debbie Pisaro of Coastline 840 handles the California side of that move. She is licensed in California only, so nothing on this page is an offer of real estate services in Oregon.

(310) 362-6429 · debbie@coastline840.com

Email Debbie

Debbie Pisaro, California real estate agent, DRE #01369110. Coastline 840 is a brand of Side, Inc., CA DRE #02014153, responsible broker.

Debbie Pisaro of Coastline 840 · California real estate agent, DRE #01369110 · Inman Luxury Leader · About

Debbie Pisaro is a 24-year veteran, a California real estate agent, DRE #01369110, and the founder of Coastline 840, a boutique California practice and a DBA of Side, Inc., CA DRE #02014153. She is an Inman Luxury Leader, representing buyers and sellers across California.

Sources

Debbie Pisaro