Contra Costa County GIS Maps

Contra Costa 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.

Contra Costa County Population

Contra Costa County had 1,165,927 residents in 2020. That was 11.1% higher than in 2010. Contra Costa County added 217,111 people between 2000 and 2020, which points to steady long-term growth. The county is fairly spread out, with about 1,626 people per square mile. Some of the county's most populated postal areas include Pittsburg, Antioch and Brentwood.

Population Trend in Contra Costa County CA

Contra Costa County Population per 2000, 2010 and 2020 census counts with a baseline 2030 projection.

Contra Costa County Zip Codes

Contra Costa County has 43 zip codes. Some of the county's most populated zip codes include Pittsburg (94565), Antioch (94509) and Brentwood (94513). Pittsburg is the largest zip by population, with about 100,341 residents or 9% of the county total. Together, the three largest zips account for about 20% of all county residents based on 2020 population estimates.

Most Populated Zip Codes in Contra Costa County CA

Contra Costa County Zip Code populations and trends per most recent census data.

Contra Costa County Demographics

Contra Costa County has a median age of 40.3, which makes the county a little older than California overall. About 22.2% of residents are under 18, while 16.7% 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 33.1% of the population, which points to a solid working-age base. About 44.9% 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 Contra Costa County CA

Contra Costa County School Districts

Contra Costa County is served by 8 public school districts with 126,557 students enrolled in 2024. The largest districts on the county map are Mount Diablo Unified, San Ramon Valley Unified and West Contra Costa Unified. Those three districts account for about 66% 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 Contra Costa County CA

Contra Costa County school district enrollment and trends per most recent NCES reporting data.

Contra Costa County Housing & Real Estate

Contra Costa County has a median home value of $830,800 and a median gross rent of $2,322. About 68% 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 $786,500 and homes spent about 30 days on the market.

Businesses in Contra Costa County, CA

Contra Costa County has 35,771 business listings across 1,165 categories. The largest categories in Contra Costa County business listings are Real Estate Agents (1,248, 3.5%), Churches & Religious Organizations (616, 1.7%), and Parks & Recreation (576, 1.6%). The full Contra Costa County business listings dataset includes names, categories, addresses and contact details where available. Contra Costa County packages also include U.S. Census County Business Patterns data with establishment counts, employment and payroll by industry sector.

Top Business Categories in Contra Costa County, CA

Contra Costa County Business Listings

Contra Costa County business listings sourced from Overture Maps. Includes locations with a high level of confidence.

Contra Costa County Basemaps

Contra Costa 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.

Preview a Live Package Demo

See exactly what is included in a county data package. Inspect how files are organized, the interactive data explorer and how maps and analytics are laid out. The demo loads a real sample package from California — explore the full structure before you buy.