Reviewed and updated October 9, 2026 by the SearchSystems.net editorial team. Every office link was opened and checked against the office's own site between September 24, 2026 and September 26, 2026.
Ontario, Oregon, in Malheur County, has about 12,000 residents (2024 Census Bureau estimate). The title to a parcel in Ontario is in the deed records of the County Clerk and its taxable value is set by the County Assessor; what is built on it is a matter for the city. This guide says who keeps each record and where the page for each office is.
This guide covers deeds, assessed values, city permits and records, evictions and court cases, records requests, directory links and common questions.
Related guides: Ontario public records, Malheur County property records, Ontario arrest records, Ontario warrants, Ontario inmate search, Ontario criminal records, Oregon arrest records and Oregon inmate search.
Deeds, Mortgages and Liens in Ontario
Who owns a parcel in Ontario and what it sold for are in the deed records of the County Clerk, with every lien or mortgage against the land.
SearchSystems opened and checked the County Clerk's page at malheurco.org/county-clerk/county-clerk-records-requests (page title: County Clerk Records Requests | Malheur County Oregon), phone 541-473-5151, which answered when SearchSystems opened it on September 24, 2026.
Assessed Values and the Tax Roll in Ontario
What a parcel in Ontario is taxed on is the business of the County Assessor, which also keeps the parcel maps. Under Measure 50 a property's maximum assessed value can rise no more than 3 percent a year, so the assessed value is usually far below the real market value the assessor also lists.
SearchSystems opened and checked the County Assessor's page at malheurco.org/assessor (page title: Assessor | Malheur County Oregon), phone 541-473-5117, which answered when SearchSystems opened it on September 24, 2026.
Permits and City Records in Ontario
Building permits, zoning and code cases are the city's own. For Ontario, SearchSystems opened and checked the city hall page at ontariooregon.org/?ID=38 (page title: City of Ontario, Oregon), phone (541) 881-3201, 745 SW 3rd Avenue Ontario, OR 97914, Monday- Friday 8:30 AM - 4:30 PM, which answered when SearchSystems opened it on September 26, 2026.
The city clerk's page SearchSystems verified is at ontariooregon.org/cityrecorder.html (page title: City Recorder | Ontario, OR), phone (541) 881-3232, 444 SW 4th Street Ontario, OR 97914, Monday- Friday 8:30 AM - 4:30 PM, which answered when SearchSystems opened it on September 26, 2026.
Evictions and Court Cases About Land in Ontario
An eviction, a foreclosure, a lien dispute or a quiet title suit is a court case in the Malheur County Circuit Court, and the file is public unless sealed.
The court records page SearchSystems verified for the county is at courts.oregon.gov/courts/malheur/records/pages/default.aspx, phone 541-473-5171.
Asking a County Office for a Record
Under the Oregon Public Records Law a county office must answer a request within 15 business days where practicable, after acknowledging the request within 5, and it may charge the actual cost of making the record available. The county records request page SearchSystems verified is at malheurco.org/public-records-request-policy (page title: Public Records Request | Policy | Malheur County Oregon).
More Official Property and Land Records Pages for Malheur County
The SearchSystems directory, online since 1997, lists the official pages for Malheur County and Oregon. These property pages from its Malheur County listing were opened again on October 2, 2026 and each one still answers:
- Portland Metro (gis.oregonmetro.gov)
Frequently Asked Questions
Who records deeds in Ontario?
The County Clerk, at malheurco.org, phone 541-473-5151. Deeds, mortgages and liens on land in Ontario are filed there, and the County Assessor (malheurco.org/assessor) has the assessment records.
Who sets the assessed value of a property in Ontario?
The County Assessor, whose page SearchSystems verified is at malheurco.org/assessor.
Where are evictions from Ontario filed?
In the Malheur County Circuit Court. The file is public unless the court seals it.
How is property assessed in Oregon?
Under Measure 50 a property's maximum assessed value can rise no more than 3 percent a year, so the assessed value is usually far below the real market value the assessor also lists.
Is this the official Ontario website?
No. SearchSystems.net is an independent public records guide, online since 1997. It links to the official city, county, court and state offices described above and does not hold records, charge for them or take requests.