Ada County GIS Maps
Ada County, Idaho, has 494,967 residents across 216,561 parcels and covers 1,052.0 square miles. The population grew 26.2% between the 2010 and 2020 census. More residents moved in than left over that decade. The FIPS code for Ada County is 16001.
Boise City is the county's largest population center. Ada County also includes 16 zip codes, 4 public school districts and 13 municipalities. Those boundaries help explain why population, schools, and housing can look different from one part of the county to another. The map below shows how those county lines, zip codes, and school districts fit together, and the sections that follow use that same geography to show parcel data, population, demographics, school enrollment and housing patterns in more detail.
Maps, GIS layers, Parcels and sample data. Paid packages add full layers, analytics and database files.
Ada County Trends
- Population
- 494,967▴
- Median Home Value
- $476,000▴
- K-12 Enrollment
- 67,476▾
County analytics dashboards with historical trends & projections included in package downloads.
Free starter access previews county maps, lightweight GIS, and sample data. Paid packages unlock full GIS layers, analytics, and database files.
Ada County Maps
The maps below show a few of the county map styles included in our downloads. County packages include map exports in JPEG, PNG, SVG, PDF and GeoTIFF formats plus more than 20 GIS layers for mapping, research and analysis. Available layers include zip codes, area codes, subdivisions, school districts, political boundaries, roads, water features, points of interest and more.
County packages also include historical county demographics, business intelligence, analytical dashboards, AI-ready prompts, markdown files and related reference data. Everything is organized to save hours of manual work collecting current data, cleaning it and joining it together. That makes it easier to move faster on analytics, due diligence, business planning and location research. Paid packages are built for commercial use, but some package contents include source-specific attribution or notice guidance. Review Licensing & Data Source Notices.
Ada County Parcels
Ada County has 216,561 mapped parcels covering 653,908 acres. The median lot size is 0.20 acres. 5,012 parcels are 10 acres or larger. Lot sizes are on nearly every parcel. Browse the interactive Ada County Parcel viewer here.
Ada County Parcel Data Coverage
| Field | Parcels | Coverage |
|---|---|---|
| Parcel ID | 216,561 | 100% |
| Owner name | 0 | 0% |
| Owner mailing address | 0 | 0% |
| Site address | 0 | 0% |
| Land use code | 0 | 0% |
| Land use description | 0 | 0% |
| Assessed value | 0 | 0% |
| Land value | 0 | 0% |
| Improvement value | 0 | 0% |
| Acreage | 216,561 | 100% |
| Parcel boundary | 216,561 | 100% |
| Download all Ada County parcels. | ||
Field coverage measured across all Ada County parcel records.
Ada County Population
Ada County had 494,967 residents in 2020. That was 26.2% higher than in 2010. Ada County added 194,063 people between 2000 and 2020, which points to steady long-term growth. Boise City is the largest city in the county, but it accounts for only about 48% of the total population. The county is fairly spread out, with about 470 people per square mile. Some of the county's most populated postal areas include Meridian, Boise and Meridian.
Population Trend in Ada County ID
Ada County Population per 2000, 2010 and 2020 census counts with a baseline 2030 projection.
Ada County Zip Codes
Ada County has 16 zip codes. Some of the county's most populated zip codes include Meridian (83646), Boise (83709) and Meridian (83642). Meridian is the largest zip by population, with about 69,818 residents or 14% of the county total. Together, the three largest zips account for about 37% of all county residents based on 2020 population estimates.
Most Populated Zip Codes in Ada County ID
| ZIP | Area | Population | Trend |
|---|---|---|---|
| 83646 | Meridian | 69,818 | ▴ 48.2% |
| 83709 | Boise | 59,461 | ▴ 18.8% |
| 83642 | Meridian | 55,465 | ▴ 49.9% |
| 83704 | Boise | 42,430 | ▴ 7.1% |
| 83706 | Boise | 34,446 | ▴ 15.9% |
| Download all zip code data | |||
Ada County Zip Code populations and trends per most recent census data.
Ada County Demographics
Ada County has a median age of 38.3, which makes the county a little older than Idaho overall. About 22.5% of residents are under 18, while 15.7% are 65 or older. That gives the county a fairly even mix of younger families and older adults. The largest age group is 25 to 44 at about 34.8% of the population, which points to a solid working-age base. About 43.9% of adults have a bachelor's degree or higher, above the statewide figure of 31.2%. The county is mostly White by population, though Hispanic, Asian, Black and multiracial residents are also part of the local mix.
Key Demographics for Ada County ID
Median Age
38.3
Under 18
22.5%
Age 65+
15.7%
Bachelor's+
43.9%
Ada County School Districts
Ada County is served by 4 public school districts with 67,476 students enrolled in 2024. The largest districts on the county map are Meridian Joint 2, Boise City Independent 1 and Kuna Joint 3. Those three districts account for about 99% of public school enrollment in the map area. Total enrollment has stayed fairly steady in recent years, but it is slightly lower than it was in 2017.
Largest School Districts by Enrollment in Ada County ID
| District | Enrollment | Share | Trend |
|---|---|---|---|
| Meridian Joint School District 2 | 38,740 | 57.4% | ▾ -0.6% |
| Boise City Independent School District 1 | 22,134 | 32.8% | ▾ -1.3% |
| Kuna Joint School District 3 | 5,778 | 8.6% | ▾ -0.3% |
| Melba Joint School District 136 | 824 | 1.2% | ▴ 2.7% |
| Download all school district data | |||
Ada County school district enrollment and trends per most recent NCES reporting data.
Ada County Housing & Real Estate
Ada County has a median home value of $476,000 and a median gross rent of $1,465. About 71% of occupied homes in the county are owner-occupied, so the local housing market leans heavily toward ownership. Home values run above the Idaho median, while rents come in above the state average. In March 2026, the median listing price was $666,950 and homes spent about 38 days on the market.
Ada County Housing Mix
Ada County housing mix: owner, renter and vacant units.
Ada County Housing Trends
Ada County median home value and rent trend (last 5 years).
Businesses in Ada County, ID
Ada County has 23,530 business listings across 1,111 categories. The largest categories in Ada County business listings are Real Estate Agents (714, 3.0%), Medical Offices (641, 2.7%), and Beauty Salons (331, 1.4%). The full Ada County business listings dataset includes names, categories, addresses and contact details where available. Ada County packages also include U.S. Census County Business Patterns data with establishment counts, employment and payroll by industry sector.
Top Business Categories in Ada County, ID
| Category | Businesses | Share |
|---|---|---|
| Real Estate Agents | 714 | 3.0% |
| Medical Offices | 641 | 2.7% |
| Beauty Salons | 331 | 1.4% |
| Churches & Religious Organizations | 309 | 1.3% |
| Contractors | 282 | 1.2% |
| Insurance Agencies | 278 | 1.2% |
| Landmark And Historical Building | 247 | 1.0% |
| Real Estate | 246 | 1.0% |
| Hair Salons | 243 | 1.0% |
| Professional Services | 239 | 1.0% |
Ada County Business Listings
| Business | Category | City |
|---|---|---|
| Boise Clearview - Retractable Screens | 3D Printing Service | Boise |
| Zelus Recovery | Abuse And Addiction Treatment | Meridian |
| Bronco Shop | Academic Bookstore | Boise |
| Identity Boise | Accommodation | Boise |
| Renewable Energy Tax Experts | Accountant | Eagle |
| RAGERS Smash N Axe | Active Life | Boise |
| Waleli Wellness | Acupuncture | Meridian |
| A New Beginning Adoption Agency | Adoption Services | Boise |
| Stevens-Henager College | Adult Education | Boise |
| Eclipse | Adult Entertainment | Boise |
| Download Ada County business listings | ||
Ada County business listings sourced from Overture Maps. Includes locations with a high level of confidence.
Ada County Basemaps
Ada County map and data packages include a set of useful basemaps to help you get started quickly. These include a custom light grey canvas, USGS topo, imagery and other reference layers that make it easier to build clear, meaningful county maps using the included GIS layers, your own data or both. Pre-rendered map tiles for the light grey basemap are included so you can use them offline or host them on your own CDN.
Get the Full Ada County Data Package
This page shows a preview of what's included in the Ada County data package. The full package gives you a ready-to-use county data system with GIS layers, historical data, maps, database files and planning tools that save hours of manual data gathering, cleanup and joins. Everything is organized to help you skip data wrangling and start analysis faster.
- 20+ GIS layers for parcels, zip codes, school districts, roads, water, boundaries and more
- Historical county demographics, housing, income and trend data
- ZIP code population files and school district enrollment history
- Database files, markdowns, AI-ready prompts and documentation
- Map exports in PNG, JPEG, PDF, SVG and GeoTIFF formats
- Offline-ready data explorer, map and analytics tools
Paid packages support commercial use, client work, and derived outputs. Some package contents may include source-specific attribution or provider notices. See Licensing & Data Source Notices.
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Nearby Counties
Browse county data pages for the counties that border Ada County. These nearby pages include the same mix of county maps, demographic summaries, school district context, housing trends and package links.