Marin County GIS Maps
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Marin County, California, has 262,321 residents and covers 520.5 square miles. The population grew 3.9% between the 2010 and 2020 census. More residents moved in than left over that decade. The FIPS code for Marin County is 06041.
San Rafael is the county's largest population center. Marin County also includes 29 zip codes, 2 public school districts and 11 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.
Marin County Trends
- Population
- 262,321▴
- Median Home Value
- $1,390,000▴
- K-12 Enrollment
- 7,668▴
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.
Marin 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.
Marin County Population
Marin County had 262,321 residents in 2020. That was 3.9% higher than in 2010. Marin County added 15,032 people between 2000 and 2020, which points to steady long-term growth. The county is fairly spread out, with about 504 people per square mile. Some of the county's most populated postal areas include San Rafael, Petaluma and Mill Valley.
Population Trend in Marin County CA
Marin County Population per 2000, 2010 and 2020 census counts with a baseline 2030 projection.
Marin County Zip Codes
Marin County has 29 zip codes. Some of the county's most populated zip codes include San Rafael (94901), Petaluma (94952) and Mill Valley (94941). San Rafael is the largest zip by population, with about 43,338 residents or 17% of the county total. Together, the three largest zips account for about 41% of all county residents based on 2020 population estimates.
Most Populated Zip Codes in Marin County CA
| ZIP | Area | Population | Trend |
|---|---|---|---|
| 94901 | San Rafael | 43,338 | ▴ 5.3% |
| 94952 | Petaluma | 33,619 | ▴ 2.3% |
| 94941 | Mill Valley | 31,480 | ▴ 3.2% |
| 94903 | San Rafael | 30,514 | ▴ 5.1% |
| 94947 | Novato | 24,870 | ▴ 2.4% |
| Download all zip code data | |||
Marin County Zip Code populations and trends per most recent census data.
Marin County Demographics
Marin County has a median age of 47.3, which makes the county a little older than California overall. About 19.7% of residents are under 18, while 23.3% 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 27.4% of the population, which points to a solid working-age base. About 60.5% of adults have a bachelor's degree or higher, above the statewide figure of 36.5%. 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 Marin County CA
Median Age
47.3
Under 18
19.7%
Age 65+
23.3%
Bachelor's+
60.5%
Marin County School Districts
Marin County is served by 2 public school districts with 7,668 students enrolled in 2024. Several larger districts account for a substantial share of students across the county map area. Those three districts account for about 100% 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 Marin County CA
| District | Enrollment | Share | Trend |
|---|---|---|---|
| Novato Unified School District | 7,199 | 93.9% | ▴ 0.6% |
| Shoreline Unified School District | 469 | 6.1% | ▾ -1.3% |
| Download all school district data | |||
Marin County school district enrollment and trends per most recent NCES reporting data.
Marin County Housing & Real Estate
Marin County has a median home value of $1,390,000 and a median gross rent of $2,584. About 64% of occupied homes in the county are owner-occupied, so the local housing market leans heavily toward ownership. Home values run above the California median, while rents come in above the state average. In March 2026, the median listing price was $1,396,000 and homes spent about 23 days on the market.
Marin County Housing Mix
Marin County housing mix: owner, renter and vacant units.
Marin County Housing Trends
Marin County median home value and rent trend (last 5 years).
Businesses in Marin County, CA
Marin County has 13,182 business listings across 953 categories. The largest categories in Marin County business listings are Real Estate Agents (295, 2.2%), Parks & Recreation (288, 2.2%), and Community & Nonprofits (213, 1.6%). The full Marin County business listings dataset includes names, categories, addresses and contact details where available. Marin County packages also include U.S. Census County Business Patterns data with establishment counts, employment and payroll by industry sector.
Top Business Categories in Marin County, CA
| Category | Businesses | Share |
|---|---|---|
| Real Estate Agents | 295 | 2.2% |
| Parks & Recreation | 288 | 2.2% |
| Community & Nonprofits | 213 | 1.6% |
| Medical Offices | 177 | 1.3% |
| Contractors | 173 | 1.3% |
| Landmark And Historical Building | 165 | 1.3% |
| Auto Repair | 165 | 1.3% |
| Hair Salons | 160 | 1.2% |
| Professional Services | 155 | 1.2% |
| Gyms & Fitness | 152 | 1.2% |
Marin County Business Listings
| Business | Category | City |
|---|---|---|
| Newport Institute | Abuse And Addiction Treatment | San Rafael |
| College of Marin Bookstore | Academic Bookstore | Kentfield |
| World Green Acai Bowl Juice | Acai Bowls | Larkspur |
| Americas Best Value Inn Novato Marin Sonoma | Accommodation | Novato |
| Protea Financial | Accountant | Novato |
| Tomales Bay, CA | Active Life | Tomales |
| Tongbu Wellness Center | Acupuncture | Novato |
| Addiction Treatment San Rafael | Addiction Rehabilitation Center | San Rafael |
| The Coaches Training Institute | Adult Education | San Rafael |
| Pleasures of the Heart, San Rafael | Adult Entertainment | San Rafael |
| Download Marin County business listings | ||
Marin County business listings sourced from Overture Maps. Includes locations with a high level of confidence.
Marin County Basemaps
Marin 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 Marin County Data Package
This page shows a preview of what's included in the Marin 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 Marin County. These nearby pages include the same mix of county maps, demographic summaries, school district context, housing trends and package links.