Idaho local data guide

Updating Mailing Addresses in Ada County

To update the mailing address associated with your property tax records in Ada County, you must contact the Ada County Assessor's office. While the Ada County Treasurer is responsible for collecting tax payments, the Assessor is the office that maintains the official records regarding property ownership and mailing address information for tax notifications.

Updated with grounded research as of 2026-09-12.

The short answer

If you need to change the mailing address for your property tax bills, you should contact the Ada County Assessor's office. This office manages the official property records, including the mailing addresses used for all property-related tax correspondence. Please note that the Ada County Treasurer's office does not manage these records; they only handle the billing and collection of the taxes themselves.

Key facts

Primary Contact for Mailing Address Changes
The Ada County Assessor's Office is responsible for maintaining ownership and mailing address records for property tax purposes.
Role of the County Treasurer
The Ada County Treasurer manages tax billing, payment collections, and disbursement of funds, but does not update owner mailing address records.

Process for Updating Property Tax Correspondence

To ensure you receive your tax assessment notices and bills at the correct location, you must submit an address change request directly to the Ada County Assessor. Maintaining an accurate mailing address is essential, as this address is used for all official correspondence regarding your property valuation and tax responsibilities.

Distinction Between Agencies

It is important to distinguish between property tax records and other state or county records. The Assessor’s office manages property records; they do not handle changes for driver's licenses, state identification cards, or vehicle registrations. If you need to update your address for DMV services, you must contact the Idaho Transportation Department (ITD) or your local county DMV office separately.

Property Tax Responsibilities

While the Assessor updates your contact information for tax notices, the Ada County Treasurer handles the actual tax bills and collections. If you have questions specifically regarding a tax bill, payment due dates, or payment history, you should contact the Treasurer’s office. If your questions concern the assessed value of your property, you should direct those inquiries to the Assessor's office.

Common questions

Can I update my mailing address through the Ada County Treasurer's website?

No. The Treasurer's online payment portal is designed for viewing tax bills and making payments. Address changes for property records must be directed to the Ada County Assessor's office.

Does updating my address with the DMV also update my property tax records?

No. Address records for the Idaho Transportation Department (DMV) and Ada County property tax records are maintained in separate systems. You must update each entity individually.

What if I have an address change for a business property?

The process remains the same for property owners; you should contact the Ada County Assessor to ensure your business property tax records reflect the correct mailing address.

Related Idaho questions

  • How do I contact the Ada County Assessor's office?
  • When are property taxes due in Ada County?
  • How do I update my address with the Idaho DMV?

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