Washtenaw County GIS Maps
Washtenaw County, Michigan, has 372,258 residents and covers 706 square miles. The population grew 8% between the 2010 and 2020 census. More residents moved in than left over that decade. The FIPS code for Washtenaw County is 26161.
Ann Arbor is the county's largest population center. Washtenaw County also includes 14 zip codes, 18 public school districts and 46 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 population, demographics, school enrollment and housing patterns in more detail.
Maps, GIS layers and sample data. Paid packages add full layers, analytics and database files.
Washtenaw County Trends
- Population
- 372,258▴
- Median Home Value
- $353,000▴
- K-12 Enrollment
- 78,529▾
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.
Washtenaw 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.
Washtenaw County Population
Washtenaw County had 372,258 residents in 2020. That was 8% higher than in 2010. Washtenaw County added 49,363 people between 2000 and 2020, which points to steady long-term growth. The county is fairly spread out, with about 527 people per square mile. Some of the county's most populated postal areas include Ypsilanti, Ann Arbor and Ann Arbor.
Population Trend in Washtenaw County MI
Washtenaw County Population per 2000, 2010 and 2020 census counts with a baseline 2030 projection.
Washtenaw County Zip Codes
Washtenaw County has 14 zip codes. Some of the county's most populated zip codes include Ypsilanti (48197), Ann Arbor (48103) and Ann Arbor (48104). Ypsilanti is the largest zip by population, with about 67,895 residents or 18% of the county total. Together, the three largest zips account for about 44% of all county residents based on 2020 population estimates.
Most Populated Zip Codes in Washtenaw County MI
| ZIP | Area | Population | Trend |
|---|---|---|---|
| 48197 | Ypsilanti | 67,895 | ▴ 11.1% |
| 48103 | Ann Arbor | 55,605 | ▴ 4.8% |
| 48104 | Ann Arbor | 41,588 | ▴ 8.5% |
| 48198 | Ypsilanti | 40,067 | ▴ 4.9% |
| 48105 | Ann Arbor | 38,883 | ▴ 14.7% |
| Download all zip code data | |||
Washtenaw County Zip Code populations and trends per most recent census data.
Washtenaw County Demographics
Washtenaw County has a median age of 34.8, which makes the county a little younger than Michigan overall. About 18.4% of residents are under 18, while 15.3% 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 31.6% of the population, which points to a solid working-age base. About 58.1% of adults have a bachelor's degree or higher, above the statewide figure of 31.8%. The county is majority White by population, with Hispanic, Asian, Black and multiracial residents making up a meaningful share of the local mix.
Key Demographics for Washtenaw County MI
Median Age
34.8
Under 18
18.4%
Age 65+
15.3%
Bachelor's+
58.1%
Washtenaw County School Districts
Washtenaw County is served by 18 public school districts with 78,529 students enrolled in 2024. The largest districts on the county map are Ann Arbor Public Schools, Plymouth-Canton Community Schools and South Lyon Community Schools. Those three districts account for about 52% 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 Washtenaw County MI
| District | Enrollment | Share | Trend |
|---|---|---|---|
| Ann Arbor Public Schools | 16,551 | 21.1% | ▾ -0.7% |
| Plymouth-Canton Community Schools | 15,910 | 20.3% | ▾ -1.1% |
| South Lyon Community Schools | 8,231 | 10.5% | ▾ -0.1% |
| Northville Public Schools | 7,006 | 8.9% | ▴ 0.8% |
| Saline Area Schools | 4,596 | 5.9% | ▾ -1.5% |
| Download all school district data | |||
Washtenaw County school district enrollment and trends per most recent NCES reporting data.
Washtenaw County Housing & Real Estate
Washtenaw County has a median home value of $353,000 and a median gross rent of $1,400. About 62% of occupied homes in the county are owner-occupied, so the local housing market leans heavily toward ownership. Home values run above the Michigan median, while rents come in above the state average. In March 2026, the median listing price was $467,738 and homes spent about 37 days on the market.
Washtenaw County Housing Mix
Washtenaw County housing mix: owner, renter and vacant units.
Washtenaw County Housing Trends
Washtenaw County median home value and rent trend (last 5 years).
Businesses in Washtenaw County, MI
Washtenaw County has 14,948 business listings across 976 categories. The largest categories in Washtenaw County business listings are Churches & Religious Organizations (294, 2.0%), Real Estate Agents (265, 1.8%), and Parks & Recreation (254, 1.7%). The full Washtenaw County business listings dataset includes names, categories, addresses and contact details where available. Washtenaw County packages also include U.S. Census County Business Patterns data with establishment counts, employment and payroll by industry sector.
Top Business Categories in Washtenaw County, MI
| Category | Businesses | Share |
|---|---|---|
| Churches & Religious Organizations | 294 | 2.0% |
| Real Estate Agents | 265 | 1.8% |
| Parks & Recreation | 254 | 1.7% |
| Community & Nonprofits | 244 | 1.6% |
| College University | 202 | 1.4% |
| Landmark And Historical Building | 197 | 1.3% |
| Hair Salons | 186 | 1.2% |
| Gyms & Fitness | 176 | 1.2% |
| Professional Services | 172 | 1.2% |
| Contractors | 153 | 1.0% |
Washtenaw County Business Listings
| Business | Category | City |
|---|---|---|
| Workit Health | Abuse And Addiction Treatment | Ann Arbor |
| Barnes & Noble | Academic Bookstore | Ann Arbor |
| Arbor Landings Apartments | Accommodation | Ann Arbor |
| Yeo & Yeo CPAs & Advisors | Accountant | Ann Arbor |
| Windy Acres Farm | Active Life | Willis |
| Common Source Community Acupuncture and Apothecary | Acupuncture | Ypsilanti |
| Brendan Sullivan, DO | Addiction Rehabilitation Center | Ypsilanti |
| Hands Across The Water, Inc. | Adoption Services | Ann Arbor |
| Builders License Training Institute | Adult Education | Ann Arbor |
| Spencer's | Adult Entertainment | Ann Arbor |
| Download Washtenaw County business listings | ||
Washtenaw County business listings sourced from Overture Maps. Includes locations with a high level of confidence.
Washtenaw County Basemaps
Washtenaw 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 Washtenaw County Data Package
This page shows a preview of what's included in the Washtenaw 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 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 Washtenaw County. These nearby pages include the same mix of county maps, demographic summaries, school district context, housing trends and package links.