Find Property Records in Mountlake Terrace
Mountlake Terrace property records are kept at the county level by Snohomish County. The Snohomish County Assessor handles all parcel valuations, ownership data, and tax records for properties in Mountlake Terrace, while the Snohomish County Auditor records deeds, mortgages, and other instruments affecting real estate in the city. This page explains how to search those records, what to expect from the online tools, and where to go if you need documents or official copies.
Mountlake Terrace Overview
Mountlake Terrace Property Records Through Snohomish County
The Snohomish County Assessor maintains all property records for Mountlake Terrace. This includes parcel maps, legal descriptions, building details, ownership history, and assessed values. Under RCW 84.40.020, the assessor must make these records publicly available, and the office does so through an online search portal at snohomishcountywa.gov/2934/Assessor. You can search by address or parcel number. Results show the assessed value, property class, lot dimensions, building data, and sales history.
Washington law requires assessors to value property at 100% of true and fair market value as of January 1 each year, as confirmed in Chapter 36.21 RCW. For Mountlake Terrace owners who think their assessment is too high, the appeal process starts with the Snohomish County Board of Equalization. You have 30 days from the date on your change-of-value notice to file. The assessor's office phone numbers are: Main Line (425) 388-3433, Residential (425) 388-6555, Commercial (425) 388-3390, and Exemptions (425) 388-3540.
Exemption programs are a notable feature of the Snohomish County Assessor's work. The Senior Exemption income limits were raised for 2024, with the maximum disposable income threshold set at $75,000. Qualifying seniors get a reduction in their taxable assessed value. Disabled persons and veterans may also qualify. Applications and status checks are available through the assessor's website at snohomishcountywa.gov or by calling the exemptions line.
The City of Mountlake Terrace runs its own services portal at cityofmlt.com, where residents can access building permits, planning documents, and utility billing. City Hall is at 23204 58th Ave W, and the main phone is (425) 776-1161. For permits, staff service hours run Monday through Friday 8 AM to 5 PM.
Visit the Mountlake Terrace city website for permit and planning records linked to your property.
The city's online portal ties into the county permitting database and lets you check on active building permits or code enforcement actions associated with any address.
Snohomish County Assessor Records for Mountlake Terrace
The Snohomish County Assessor's SCOPI mapping tool is an interactive GIS application that displays parcel boundaries, aerial imagery, and property characteristics for every parcel in the county, including Mountlake Terrace. You can zoom to any address, click a parcel, and pull up its details in one step. The SCOPI tool is linked from the assessor's main page and does not require a login. It is especially useful for visually confirming lot boundaries or comparing nearby parcels.
Beyond SCOPI, the assessor maintains detailed property characteristic files. These include data on square footage, number of bedrooms and bathrooms, construction type, condition rating, and effective year built. Real estate professionals, appraisers, and lenders use these files regularly. The data feeds into the assessed value, which in turn determines the annual property tax bill. The Snohomish County Assessor's mailing address is 3000 Rockefeller Ave, M/S 510, Everett, WA 98201. You can email at contact.assessor@snoco.org.
Note: Assessment rolls and property characteristics are public records available for inspection at any time without a formal records request.
Access the Snohomish County Assessor's property search to look up Mountlake Terrace parcel data online.
The Snohomish County Assessor's portal covers all Mountlake Terrace parcels and links to the SCOPI mapping tool for a visual property search experience.
Recorded Real Estate Documents in Mountlake Terrace
Every deed, mortgage, deed of trust, lien, and easement affecting Mountlake Terrace real estate must be recorded with the Snohomish County Auditor. The auditor's recording division is at 3000 Rockefeller Avenue, Everett, WA 98201 (phone: 425-388-3494). Under RCW 65.08.070, any instrument that creates, transfers, or assigns an interest in real property qualifies as a conveyance and must be recorded to establish priority and provide public notice. Recording happens at the county level, not the city level, so Mountlake Terrace's location within Snohomish County directs all of its real estate recording to Everett.
The Snohomish County Auditor's website at snohomishcountywa.gov/162/Auditor-Recorder gives access to the recorded document search system. You can search by party name, document type, or recording date. Documents recorded after the system's cutoff date are fully searchable online. For older documents not yet in the digital system, a visit to the county archives may be needed. Certified copies of recorded documents can be ordered by mail or in person. Fees apply for certified copies; plain copies cost less.
Under RCW 36.22.010, the county auditor serves as the recording officer and must accept qualifying documents without delay once the proper fee is tendered. Real estate excise tax under RCW 82.45 must be paid, or exemption confirmed, before the auditor records a deed.
Property Tax Records and State Resources
The Snohomish County Treasurer handles property tax billing and collection for Mountlake Terrace. Tax statements are mailed once a year. Payments are due in two halves: April 30 and October 31. Late payments accrue interest and penalties. The Washington Department of Revenue's county directory links directly to both the Snohomish County Assessor and Treasurer and is a reliable starting point when you are not sure which office handles what.
For historical property records going back to the 1930s and 1940s, the Washington State Digital Archives hosts digitized real property record cards for many Washington counties. These cards include ownership data, construction dates, and sometimes photographs of the buildings. They are searchable by parcel number or address and are free to access. If you need to trace a Mountlake Terrace property's ownership history before modern digital records, this is a good place to start. The MRSC guide on county officials gives a plain-language explanation of how the assessor, auditor, and treasurer each fit into the property records system in Washington.
Snohomish County Property Records
Mountlake Terrace is in Snohomish County, and all property records for the city run through county offices in Everett. The Snohomish County page covers assessor tools, auditor recording, tax deadlines, and appeal procedures in more detail.
Nearby Cities
These qualifying cities are near Mountlake Terrace, each with its own property records page.