Mendocino County, California GIS Map
This GIS map of Mendocino County, California (CA) shows the official Census county boundary (FIPS 06045), with federal layers you can switch on for FEMA flood zones, USGS elevation contours and hillshade, NLCD land cover, and school district lines.
Mendocino County has a population of about 90,244 (U.S. Census Bureau, 2020-2024 ACS 5-year estimate) and a land area of 3,506.8 square miles. Use the inspect tool to read coordinates, elevation and the layers under any point.
- State
- California (CA)
- Population
- 90,244
- Land area
- 3,506.8 sq mi
- Density
- 26 / sq mi
- Coordinates
- 39.4324, -123.4429
- FIPS code
- 06045
Mendocino County Demographics
Source: U.S. Census Bureau, American Community Survey 2020-2024 5-year estimates.
Population
90,244
Households
34,842
Median household income
$68,092
Median age
44.1 years
Median home value
$512,200
Median gross rent
$1,317/mo
Owner-occupied homes
61.7%
Bachelor's degree or higher
25.2%
Below poverty level
15.4%
Land area
3,506.8 sq mi
Population density
26 / sq mi
Mendocino County Population Growth
Source: U.S. Census Bureau, 2010 Census and Population Estimates Program (Vintage 2024: April 2020 estimates base and July 1, 2024 estimate).
2010 Census
87,841
April 2020 (estimates base)
91,587
July 2024 estimate
89,175
Change 2010-2020
+4.3%
Change 2020-2024
-2.6%
Natural Hazard Risk in Mendocino County
FEMA National Risk Index ratings for Mendocino County, compared with all U.S. counties.
Overall risk
Score 94.3 of 100
Expected annual loss
Buildings, population & agriculture
Social vulnerability
Susceptibility to hazard impacts
Community resilience
Ability to prepare & recover
Risk by Hazard
- LandslideRelatively High
- EarthquakeRelatively High
- WildfireRelatively High
- DroughtRelatively High
- Inland FloodingRelatively High
- Volcanic ActivityVery Low
- Coastal FloodingRelatively Low
- Heat WaveRelatively Low
- TsunamiVery Low
- AvalancheVery Low
- LightningRelatively Low
- Winter WeatherVery Low
- TornadoVery Low
- HailVery Low
- Strong WindVery Low
Source: FEMA National Risk Index (December 2025 release). County-level ratings are relative to other U.S. counties and are not a property-specific assessment.
Environmental Conditions in Mendocino County, California
Radon potential, monitored air quality and current drought status for Mendocino County, California, from the Environmental Protection Agency and the U.S. Drought Monitor.
Radon potential
Zone 3
low radon potential
EPA predicts an average indoor level below 2 pCi/L, so the EPA still recommends testing, because elevated radon can occur anywhere.
Air quality (2024)
Median AQI 43Good
No days reached unhealthy levels.
90th percentile 57, peak 83 across 366 monitored days.
Drought status
Abnormally dry in 91.6% of the county
Drought Severity and Coverage Index 91.6 of 500.
- D0 Abnormally dry91.6%
Map of 13 October 2026.
Sources: EPA Map of Radon Zones (September 2025), EPA Air Quality Index (2024) and the U.S. Drought Monitor. A radon zone is a regional planning tool, not a prediction for any individual home — the EPA recommends testing every home regardless of zone. Air quality is shown only for counties that host an EPA monitor. Drought figures describe one weekly map, not a long-term climate average. Compare counties in California.
GIS Data for Mendocino County, CA
The Mendocino County GIS map on this page loads live federal layers in your browser, so you can check flood zones, terrain, land cover and district boundaries anywhere in Mendocino County without a separate GIS login. All of the Mendocino GIS data below is drawn from public U.S. government sources.
Layers you can turn on
FEMA flood zones
National Flood Hazard Layer — flood insurance rate map zones and floodways.
Elevation contours and hillshade
USGS 3DEP terrain, so you can read slope and relief across the county.
Land cover
NLCD land cover classes — forest, developed, wetland and water.
School districts
Census TIGER unified and elementary school district boundaries.
ZIP code and county boundaries
Census TIGER ZCTA and county boundary lines.
Map tools
Measure distance and area
Draw a line or polygon to get length in miles or area in acres.
Sketch and annotate
Add points, lines and shapes on top of the map.
Inspect any point
Click the map to read coordinates, elevation and the layers under your cursor.
Download the map
Save the current view as a PNG image.
Where the data comes from
County boundaries come from the U.S. Census Bureau TIGER/Line program, flood zones from FEMA's National Flood Hazard Layer, terrain from the USGS 3D Elevation Program, land cover from the Multi-Resolution Land Characteristics Consortium, and demographics from the American Community Survey.
Property records and tax maps in Mendocino County
Most people who look up Mendocino County GIS data are after parcel-level records: who owns a property, what it last sold for, and what it is assessed at. Those records are kept locally, not federally, so they are not part of this map. Mendocino County property and tax map data lives with the county's own records office, and what that office is called varies by state — Texas counties run an appraisal district (usually searched as a “CAD”), Kentucky uses a Property Valuation Administrator (PVA), and most other states use a county assessor, auditor or tax office. Start with that office for a deed, a tax map number or a parcel boundary; use the map above for flood zones, elevation and land cover on the same land.
Mendocino County FAQ
What state is Mendocino County in?
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Mendocino County is a county in California (CA).
What is the population of Mendocino County?
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Mendocino County, California has a population of about 90,244, according to the U.S. Census Bureau American Community Survey.
How big is Mendocino County?
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Mendocino County covers about 3,506.8 square miles of land, with a population density of roughly 26 people per square mile.
What is the FIPS code for Mendocino County?
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The FIPS county code for Mendocino County, California is 06045. It is used to identify the county in federal datasets such as Census TIGER and FEMA flood maps.
What is the median household income in Mendocino County?
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The median household income in Mendocino County, California is about $68,092 per year.
What is the radon zone for Mendocino County?
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Mendocino County is in EPA radon Zone 3, meaning the EPA predicts an average indoor radon level below 2 pCi/L. In this zone the EPA still recommends testing, because elevated radon can occur anywhere. The EPA is clear that a radon zone is a regional planning tool and not a prediction for any individual home.
What is the air quality in Mendocino County?
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Across 2024, the EPA monitor covering Mendocino County recorded a median Air Quality Index of 43 (Good) and a 90th percentile of 57, with a peak of 83. No days reached the unhealthy for sensitive groups category. Only counties that host an EPA monitor have these figures.
Is Mendocino County in a drought?
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As of the 13 October 2026 U.S. Drought Monitor map, abnormally dry covers 91.6% of Mendocino County, and the county's Drought Severity and Coverage Index is 91.6 out of 500.
What is Mendocino GIS?
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Mendocino GIS usually refers to the county's own parcel and zoning mapping system, which Mendocino County publishes itself. This page is a separate, free viewer: it draws federal GIS layers — FEMA flood zones, USGS elevation, NLCD land cover and Census boundaries — over the Mendocino County boundary, with no login required.
What GIS data is available for Mendocino County?
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The Mendocino County map loads federal GIS layers directly in your browser: FEMA National Flood Hazard Layer flood zones, USGS 3DEP elevation contours and hillshade, NLCD land cover, Census TIGER school district boundaries, and TIGER ZIP code and county boundary lines.
How do I check flood zones in Mendocino County?
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Open the Mendocino County map, turn on the FEMA flood zones layer, and zoom in. The National Flood Hazard Layer shows flood insurance rate map zones and floodways. Flood zones only draw once you are zoomed in far enough.
How do I find the coordinates or elevation of a spot in Mendocino County?
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Use the inspect tool on the Mendocino County map and click any point. It reads back the coordinates, elevation and the layers under your cursor. You can also measure distance and area by drawing a line or polygon.
Data sources for Mendocino County, California
Every figure on this page comes from a published government dataset. Each source is listed with its release date so you can check the number or cite it directly.
- American Community Survey 5-year estimates
U.S. Census Bureau · 2020-2024 · population, income, housing, education and poverty figures
- Gazetteer Files
U.S. Census Bureau · 2024 · place coordinates, land area and the county/place/ZIP crosswalk
- TIGER/Line Shapefiles
U.S. Census Bureau · 2024 · county, ZIP Code Tabulation Area and school district boundaries
- National Flood Hazard Layer
Federal Emergency Management Agency · current effective Flood Insurance Rate Maps · flood zones, floodways and base flood elevations
- National Risk Index
Federal Emergency Management Agency · v1.20, December 2025 · county natural hazard risk, expected annual loss, social vulnerability and resilience
- 3D Elevation Program (3DEP)
U.S. Geological Survey · current · elevation contours, shaded relief and point elevations
- National Land Cover Database
Multi-Resolution Land Characteristics Consortium · NLCD 2021 · land cover classes such as developed, forest, crop and water
- Map of Radon Zones
U.S. Environmental Protection Agency · September 2025 · the county radon zone (1, 2 or 3) and its predicted indoor radon potential
- Air Quality Index annual summary by county
U.S. Environmental Protection Agency · 2024 · median, 90th percentile and peak AQI, and days at unhealthy levels, for counties with an EPA monitor
- U.S. Drought Monitor
National Drought Mitigation Center, USDA and NOAA · weekly, current map · the share of county area in each drought category and the Drought Severity and Coverage Index
- ArcGIS basemaps
Esri · current · streets, satellite, topographic and dark gray basemap tiles
Citing this page
GIS Map, “Mendocino County, California GIS Map”, https://gismap.land/county/california/mendocino. Figures from the datasets listed above.
Local notes for Mendocino County, CA
Questions and local knowledge from people who know the area. Every note is read before it appears here.