Ada County
Parcel & Property Data
About This Data
LandBrief holds 220,367 parcel records for Ada County, sourced from county records. Each includes the parcel boundary, and — where the county publishes them — owner, situs address, acreage, assessed values and legal description.
Data from the Ada County assessor roll dated September 2024, loaded August 2026. See data sources for every county’s vintage.
Explore Ada County
Ada County by the Numbers
- Median parcel size
- 0.20 acres
measured from mapped boundaries - 90th-percentile parcel
- 0.92 acres
- County land area
- 673,419 acres
U.S. Census measurement - Communities
- 12
2.7% of parcels outside any incorporated place
Who Owns Ada County?
Share of the county’s 220,367 parcels by the kind of owner on record. Classified from owner names, so the boundaries are approximate; an entity the rules cannot place counts as an individual.
| Owner type | Share of parcels |
|---|---|
| Individuals | 65.7% |
| Companies & organizations | 21.0% |
| Trusts & estates | 11.8% |
| Government | 1.3% |
| Other / unclassified | 0.2% |
The largest owner on record is CHALLENGER DEVELOPMENT INC with 1,213 parcels — see the full landowner leaderboard.
Parcel Records (~220,367 total)
| Parcel ID | Owner | Address | City | Acreage |
|---|---|---|---|---|
| S2136110500 | CITY OF BOISE (PUBLIC WORKS) | 9600 W NICHOLSON RD | Unincorporated | 2019.11 |
| S0236141800 | BHH INVESTORS 1414 LLC | W DRY CREEK RD | Boise | 1012.45 |
| S0236141800 | BHH INVESTORS 1414 LLC | W DRY CREEK RD | Boise | 1012.45 |
| S0133111000 | SEVEN GATES INVESTMENTS LP | N CARTWRIGHT RD | Unincorporated | 804.67 |
| S2631110000 | USA (BUREAU OF LAND MANAGEMENT) | S ORCHARD ACCESS RD | Boise | 703.04 |
| S2630110000 | USA (BUREAU OF LAND MANAGEMENT) | S ORCHARD ACCESS RD | Boise | 701.40 |
| S2818110000 | USA (BUREAU OF LAND MANAGEMENT) | S CINDER BUTTE RD | Boise | 700.40 |
| S2619110000 | USA (BUREAU OF LAND MANAGEMENT) | S ORCHARD ACCESS RD | Boise | 699.76 |
| S2819110000 | USA (BUREAU OF LAND MANAGEMENT) | S CINDER BUTTE RD | Boise | 698.16 |
| S2618110000 | USA (BUREAU OF LAND MANAGEMENT) | S ORCHARD ACCESS RD | Boise | 697.96 |
Download Ada County parcel data
All 220,367 parcels in Ada County as a single file — free, no account needed. Shapefile, GeoJSON, GeoPackage, CSV and Parquet.
Get Ada County on FreeParcelData →Nearby counties
Frequently Asked Questions
How many parcels are in Ada County?
The Ada County assessor roll on file records 220,367 parcels across 12 communities, with 2.7% lying outside any incorporated place.
Who owns the most land in Ada County?
CHALLENGER DEVELOPMENT INC holds 1,213 parcels, the most of any owner on record — the largest-landowners leaderboard ranks the top 25.
What is the typical parcel size in Ada County?
Measured from mapped boundaries, the median parcel is 0.20 acres, and nine parcels in ten are under 0.92 acres. Boundary-measured area closely tracks deeded acreage but is not the deed.
How much of Ada County is government-owned?
Government entities — federal, state, and local — hold 1.3% of the county’s parcels, classified from owner names on the roll.
How current is this data?
It comes from the Ada County assessor roll dated September 2024. Counties deliver on their own schedules; the methodology page explains how records are processed and the data sources page tracks every county’s vintage.
Browse by City (12)
220,367 parcels across 12 communities in Ada County.