2026 Property Tax Due Dates
December 20
Full payment or first half
June 20
Second half (if split)
Payment Methods
Online, Mail, In-Person
Ada County Treasurer
Treasurer
Elizabeth Mahn
Phone
(208) 287-6800Fax
208-287-6809
Mailing Address
PO Box 2868, Boise, ID 83701
Office Hours
How to Pay
Online
Pay using credit card or e-check
By Mail
Mail check payable to Ada County Treasurer — PO Box 2868, Boise, ID 83701, Boise ID 83701
In Person
Visit the Treasurer's office — 200 W Front St, Boise ID 83702, Mon-Fri 8am - 5pm
Other Counties in Idaho
About Ada County
Ada County is located in the southwestern part of Idaho, United States. As of the 2020 census, the county had a population of 494,967, which by 2024 was estimated to have risen to 535,799. Ada County is by far the state's most populous county; it is home to 26.
Source: Wikipedia — content available under CC BY-SA 4.0
Related Resources
Get Deadline Reminders
We'll email you 336 hours before your property taxes are due.
Due dates shown are for reference only. Contact your county treasurer's office to confirm official deadlines before making payments.