Idaho · FIPS 16001 · County seat: Boise
Ada County, ID GIS & Parcel Viewer
Here is the direct link to the county parcel map covering Ada County, ID: the Ada County ArcGIS parcel map. Below you'll find basic facts about the county, steps for using the viewer, and nearby counties.
Open the Ada County parcel map ↗
Opens gisprod.adacounty.id.gov in a new tab. We link out and never embed or copy parcel data.
Ada County at a glance
| Official map | Ada County ArcGIS parcel map |
|---|---|
| Type | County-run map |
| Website | gisprod.adacounty.id.gov |
| Access | Free, no login (checked Oct 2026) |
| County seat | Boise |
| Population | 524,673 (2023 Census Bureau estimate) |
| Land area | 1,052 sq mi |
| FIPS code | 16001 |
Where the parcel data comes from
Ada County runs this viewer (directly or through a contracted vendor), which makes it the closest thing to the source for local parcel lines. Our October 2026 check found the map open to the public, with no account or payment needed.
Finding a property on this map
- Click the button above and wait for the Web AppBuilder viewer to load. Some counties show a terms screen first.
- Search by street address, owner or parcel ID if the search box offers those options.
- Click a lot on the map to read its attributes.
- Turn on aerial imagery from the basemap tool and use the layer list to add things like zoning or flood zones when they're published.
Many parcel sites expect owner names last name first. If a full name finds nothing, try just the surname.
The county in brief
The U.S. Census Bureau estimated Ada County's population at 524,673 in 2023, spread over about 1,052 square miles of land, or roughly 499 people per square mile. That makes it the most populous of Idaho's 44 counties. Its county seat is Boise.
Neighboring counties
Ada County shares a border with the counties below. Each link has its own official map:
More on Ada County parcel maps
A note on accuracy
Treat the map as a guide, not a boundary survey: parcel outlines are often shifted a bit from the real corners. A licensed surveyor settles exact lines.