Ada County property tax
Homeowners in Ada County, Idaho typically pay about 0.52% of their home's value in property tax each year — a median bill of $2,655 on a median home value of $512,300.
Typical effective rate
0.52%
higher than 82% of U.S. counties
Median tax paid
$2,655
per year
Median home value
$512,300
In ID
#11
of 44 ranked counties
At a glance
- Effective rate 0.52% — 45% lower than the U.S. median of 0.94%, and 6% higher than the Idaho median of 0.49%.
- With vs. without a mortgage — median tax $2,610 for mortgaged homes, $2,755 for homes owned outright.
- State ranking — 11th highest effective rate of 44 ranked Idaho counties; nationally it sits around the 18th percentile.
Estimate a bill for Ada County
Apply this county's typical effective rate (0.52%) to a home value of your choice.
Frequently asked questions
What is the property tax rate in Ada County, ID?
The typical effective property-tax rate in Ada County is 0.52% of a home's value per year, based on median taxes paid ($2,655) divided by the median home value ($512,300) in the Census ACS 2020–2024 5-year estimates. This is a typical burden for comparison, not a statutory mill rate.
How much is property tax on a typical home in Ada County?
The median owner-occupied home in Ada County is valued at $512,300, and the median real estate tax paid is $2,655 per year. Homes with a mortgage have a median tax of $2,610, versus $2,755 for homes without one.
How does Ada County compare to the rest of Idaho?
Ada County's effective rate is 6% higher than the Idaho median, ranking 11th of 44 ranked counties in the state.
Compare nearby Idaho counties
Counties ranked closest to Ada County by in-state effective rate. Open the comparison tool or see all Idaho counties.
| In-state | County | Effective rate | Median tax |
|---|---|---|---|
| 8 | Caribou County | 0.56% | $1,341 |
| 9 | Clearwater County | 0.54% | $1,443 |
| 10 | Elmore County | 0.54% | $1,701 |
| 12 | Canyon County | 0.52% | $2,011 |
| 13 | Gooding County | 0.51% | $1,279 |
| 14 | Bonneville County | 0.50% | $1,858 |
Official data & resources for Ada County
- Ada County Census profile (data.census.gov) — housing, value and tax figures for this county.
- Table B25103 for Ada County — median real estate taxes paid (the source for the tax figures above).
- Table B25077 for Ada County — median home value.
- Federal forms & is property tax deductible? — IRS Pub 530, Schedule A and the SALT cap, plus your state tax agency.
Finding your exact bill
Your county or municipal assessor (sometimes called the appraisal district, property appraiser, or tax collector) sets the assessed value and the exact millage that produces your bill. Search for "[county name] [state] assessor" or "property tax" on an official .gov site.
Figures on this page are Census survey medians for the whole county (2020–2024 5-year), not an assessment of any individual property. Rates, exemptions and assessment practices vary by municipality and school district within a county.