GIS Data Download
To access our web mapping applications, please visit our Web GIS.
The County of Humboldt makes no guarantee of the quality or completeness of this data. It has not been fully reviewed for accuracy and is intended to be used for planning purposes only. The department assumes no liability or responsibility in the use of this data. While every effort has been made to assure the accuracy of this information, it should be understood that it does not have the force and effect of law, rule, or regulation. In the event of any difference or error, the law will take precedence.
The accuracy of map data varies from location to location in the county. While the GIS is useful for planning purposes, it should not be relied upon to determine property, zoning or general plan designation boundaries or be used in any way for project design. All GIS data should be verified before it is materially relied upon for property or project planning. In urban areas the GIS map data maybe inaccurate by as much as 50 feet in any direction. In rural areas the map data may be inaccurate by as much as 400 feet in any direction.
GIS data is in CA State Plane Zone 1, UTM Zone 10, or Albers Equal Area projection coordinates. Most Humboldt County GIS data is in CA State Plane Zone 1 NAD27 Units Feet coordinates. Humboldt County is not the source for all data listed below. In some cases, data must be acquired from the original source. Web links are provided when available.
Please note the following:
Disclaimer
The County of Humboldt makes no guarantee of the quality or completeness of this data. It has not been fully reviewed for accuracy and is intended to be used for planning purposes only. The department assumes no liability or responsibility in the use of this data. While every effort has been made to assure the accuracy of this information, it should be understood that it does not have the force and effect of law, rule, or regulation. In the event of any difference or error, the law will take precedence.
The accuracy of map data varies from location to location in the county. While the GIS is useful for planning purposes, it should not be relied upon to determine property, zoning or general plan designation boundaries or be used in any way for project design. All GIS data should be verified before it is materially relied upon for property or project planning. In urban areas the GIS map data maybe inaccurate by as much as 50 feet in any direction. In rural areas the map data may be inaccurate by as much as 400 feet in any direction.
Data Projection
GIS data is in CA State Plane Zone 1, UTM Zone 10, or Albers Equal Area projection coordinates. Most Humboldt County GIS data is in CA State Plane Zone 1 NAD27 Units Feet coordinates. Humboldt County is not the source for all data listed below. In some cases, data must be acquired from the original source. Web links are provided when available.
Please note the following:
- Metadata is provided in *.met text file, html, or xml files
- Downloads are compressed zip files consisting of all necessary files for each data set including projection files and metadata.
- The links below represent the most recent available data.
- Labels containing this ± symbol include data dependent on parcel lines.
Data Download
Frequently Requested Data Sets
- City Boundaries ±
- Humboldt County GIS Roadway Centerline (updated 8/1/2023)
- Land Information System (APN, Zoning, Land Use, Site Address) Updated 9/6/2023
- Parcels (updated 9/7/2023)
- County Boundary ±
Administrative Boundaries
- Board Supervisor Districts ±
- CDF State Responsibility Areas
- City Boundaries ±
- Coastal Zone Boundary
- Coastal Zone Jurisdiction Areas
- Community Planning Areas
- Community Service Districts ±
- Election Precincts ± (updated 7/7/2023)
- Fire Districts & Response Areas ±
- Humboldt County Boundary
- Public Lands ±
- School Districts ±
Biology
- Biologic Resource Areas
- Cal Fish and Wildlife Natural Diversity Database
Control / Survey Data
- United States Geological Survey (USGS) Public Land Survey Sections
- USGS Public Land Survey Townships
Demographics
Fire Plan Data
- Fire Districts and Response Areas ±
- Fire Hydrants
- Fire Stations
Geology
- Alquist Priolo Zones
- CA Faults and Bedrock
- CA Historic Landslides
Hazard Disclosure
- Areas of Potential Flooding / Dam Inundation Zones
- Earthquake Fault Zones (Alquist Priolo Zones)
- Seismic Hazard Zones (Liquefaction Areas)
Hazards
- Detailed Slope Stability Zones / Seismic Safety (Humboldt Bay Vicinity)
- FEMA HAZUS Data and Software
- Generalized Slope Stability Zones (Countywide)
- Tsunami Run-Up Lines
- Wildland Fire Rating Zones
Hydrography
- Mill Creek Wetlands
- National Wetlands Inventory
Imagery & Aerial Photography
- City of Arcata 2003 Aerial photography Web Link
- City of Eureka 2007 Aerial photography Web Link
- National Agriculture Imagery Program (NAIP) 2004 Mosaic Web Link
- National Agriculture Imagery Program (NAIP) 2005 Mosaic (MrSID Image)
- NAIP 2009 Mosaic (MrSID Image)
- NAIP 2010 Mosaic (MrSID Image)
- AIP 2012 Mosaic (MrSID Image)
- NAIP 2014 Mosaic (MrSID Image)
- NAIP 2016 Mosaic (MrSID Image)
- NAIP 2018 Mosaic (MrSID Image)
- NAIP 2020 Mosaic (MrSID Image)
- NAIP 2022 Mosaic (MrSID Image)
Land Ownership
- Land Information System (APN, Zoning, Land Use, Site Address) Updated 9/6/2023
- Parcels (updated 9/7/2023)
- Public Lands ±
Land Use
- Airport Land Use Compatibility Zones
- Arcata Airport Noise Contours
- General Plan Land Use ± (updated 6/2/2023)
- Williamson Act Agricultural Preserves 2022 ±
- Zoning ± (updated 6/2/2023)
Roads / Transportation
- Airports Web Link
- Alternate Bike Routes Web Link
- Bridges - State and Local Web Link
- Bus Routes
- CDF: Watershed Assessment 1:24,000 Roads Web Link
- City of Eureka Roadway Centerlines
- Humboldt County GIS Roadway Centerline (updated 8/1/2023)
- Legacy Digital Line Graph Roads
- Modified Tiger File Roadway Centerline
- Ports Web Link
- Railroad Lines Web Link
- Rest Stops Web Link
Soils
Topography
- Percent Slope Less Than 30% Polygons
- Percent Slope Less Than 15% Polygons
Other
- Cell Tower Locations (2001)
Contact Information
For any questions or to request data not listed on this page, please contact GIS Analyst Jerry von Dohlen via email or by calling 707-268-3776.
For any questions or to request data not listed on this page, please contact GIS Analyst Jerry von Dohlen via email or by calling 707-268-3776.