Colusa County GIS Maps
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Colusa County, California, has 21,839 residents and covers 1,150.7 square miles. The population grew 2% between the 2010 and 2020 census. More residents moved in than left over that decade. The FIPS code for Colusa County is 06011.
Colusa is the county's largest population center. Colusa County also includes 6 zip codes, 6 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 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.
Colusa County Trends
- Population
- 21,839▴
- Median Home Value
- $375,100▴
- K-12 Enrollment
- 4,732▾
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.
Colusa 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.
Colusa County Population
Colusa County had 21,839 residents in 2020. That was 2% higher than in 2010. Colusa County added 3,035 people between 2000 and 2020, which points to steady long-term growth. The county is fairly spread out, with about 19 people per square mile. Some of the county's most populated postal areas include Colusa, Williams and Arbuckle.
Population Trend in Colusa County CA
Colusa County Population per 2000, 2010 and 2020 census counts with a baseline 2030 projection.
Colusa County Zip Codes
Colusa County has 6 zip codes. Some of the county's most populated zip codes include Colusa (95932), Williams (95987) and Arbuckle (95912). Colusa is the largest zip by population, with about 7,832 residents or 36% of the county total. Together, the three largest zips account for about 87% of all county residents based on 2020 population estimates.
Most Populated Zip Codes in Colusa County CA
| ZIP | Area | Population | Trend |
|---|---|---|---|
| 95932 | Colusa | 7,832 | ▴ 1.5% |
| 95987 | Williams | 6,270 | ▴ 4.6% |
| 95912 | Arbuckle | 4,942 | ▴ 5.5% |
| 95955 | Maxwell | 1,403 | ▾ -7.5% |
| 95979 | Stonyford | 519 | ▾ -13.1% |
| Download all zip code data | |||
Colusa County Zip Code populations and trends per most recent census data.
Colusa County Demographics
Colusa County has a median age of 35.7, which makes the county a little younger than California overall. About 27.3% 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% of the population, which points to a solid working-age base. About 14.5% of adults have a bachelor's degree or higher, above the statewide figure of 36.5%. The county has a more diverse population mix, with no single race or ethnicity accounting for all of the local story.
Key Demographics for Colusa County CA
Median Age
35.7
Under 18
27.3%
Age 65+
15.3%
Bachelor's+
14.5%
Colusa County School Districts
Colusa County is served by 6 public school districts with 4,732 students enrolled in 2024. The largest districts on the county map are Colusa Unified, Pierce Joint Unified and Williams Unified. Those three districts account for about 89% of public school enrollment in the map area. Total enrollment has stayed fairly steady in recent years, based on district totals from 2017 to 2024.
Largest School Districts by Enrollment in Colusa County CA
| District | Enrollment | Share | Trend |
|---|---|---|---|
| Colusa Unified School District | 1,470 | 31.1% | ▴ 0.4% |
| Pierce Joint Unified School District | 1,447 | 30.6% | ▾ -3.1% |
| Williams Unified School District | 1,303 | 27.5% | ▾ -4.9% |
| Maxwell Unified School District | 331 | 7% | ▾ -5.4% |
| Princeton Joint Unified School District | 126 | 2.7% | ▴ 7.7% |
| Download all school district data | |||
Colusa County school district enrollment and trends per most recent NCES reporting data.
Colusa County Housing & Real Estate
Colusa County has a median home value of $375,100 and a median gross rent of $1,139. About 62% of occupied homes in the county are owner-occupied, so the local housing market leans heavily toward ownership. Home values run below the California median, while rents come in below the state average. In March 2026, the median listing price was $502,576 and homes spent about 48 days on the market.
Colusa County Housing Mix
Colusa County housing mix: owner, renter and vacant units.
Colusa County Housing Trends
Colusa County median home value and rent trend (last 5 years).
Businesses in Colusa County, CA
Colusa County has 766 business listings across 270 categories. The largest categories in Colusa County business listings are Gas Stations (22, 2.9%), Farm (21, 2.7%), and Churches & Religious Organizations (20, 2.6%). The full Colusa County business listings dataset includes names, categories, addresses and contact details where available. Colusa County packages also include U.S. Census County Business Patterns data with establishment counts, employment and payroll by industry sector.
Top Business Categories in Colusa County, CA
| Category | Businesses | Share |
|---|---|---|
| Gas Stations | 22 | 2.9% |
| Farm | 21 | 2.7% |
| Churches & Religious Organizations | 20 | 2.6% |
| Parks & Recreation | 15 | 2.0% |
| Mexican Restaurants | 15 | 2.0% |
| Elementary School | 14 | 1.8% |
| Landmark And Historical Building | 13 | 1.7% |
| Public And Government Association | 13 | 1.7% |
| ATMs | 13 | 1.7% |
| Banks & Credit Unions | 12 | 1.6% |
Colusa County Business Listings
| Business | Category | City |
|---|---|---|
| Bautista Taxes & Bookkeeping | Accountant | Williams |
| Ward's Boat Landing | Active Life | Colusa |
| Empire Nut Company | Agricultural Cooperatives | Colusa |
| Colusa County Farm Supply | Agricultural Service | Williams |
| Sun Valley Rice | Agriculture | Arbuckle |
| Reclamation District | Agriculture Association | Grimes |
| Colusa County Airport | Airport | Colusa |
| Jack's Place | American Restaurants | Colusa |
| Green Valley Homes | Apartments | Williams |
| Claudia Buchanan Artist | Arts And Crafts | Maxwell |
| Download Colusa County business listings | ||
Colusa County business listings sourced from Overture Maps. Includes locations with a high level of confidence.
Colusa County Basemaps
Colusa 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 Colusa County Data Package
This page shows a preview of what's included in the Colusa 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 Colusa County. These nearby pages include the same mix of county maps, demographic summaries, school district context, housing trends and package links.