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Quick Reference to Additional GIS Resources
This page contains links to other Internet sites that are geographically-related yet not owned or controlled by Sonoma County or PRMD GIS.
PRMD GIS makes no representations concerning the content of these sites. The inclusion of a link does not constitute an endorsement, warranty or guarantee of
the information, products or services, if any, described or offered at these other Internet sites. Links to resources outside PRMD are provided as a convenience to users and, as such, PRMD specifically disclaims any and all liability for any claims or damages that may result from the linked web sites and does not accept any responsibility for the accuracy, completeness, reliability, suitability, or timeliness of the content found on external sites. These linked sites are maintained according to their own terms and conditions of use and should be accessed at the user's own risk.
The underlying aerial photographs used in the Flood Insurance Rate Maps (FIRMs or FIRMettes) are of unknown age and should not be relied upon as an accurate depiction of development on any given parcel. The depicted floodplains are based on the most recent Flood Insurance Study (FIS) and are considered current. For further information regarding this matter, please contact Nathan Quarles, PRMD Engineering Division.
General Information about GIS
GIS.com - A great place to find additional information about GIS.
Online Maps
American Philosophical Society Map Collection
CA State Water Resources Control Board - GeoTracker
CA State Water Resources Control Board - Onsite Wastewater Treatment System Map Tool
(Is My Property Near a Nutrient or Pathogen Impaired Water Body?)
Color Landform Atlas of the United States
David Rumsey Historical Map Collection
Google Maps - Sonoma County (View Larger Map)
National Geographic Society's Map Machine
Sonoma County Street Maps - Yellow Maps
Aerial Photography and Satellite Imagery
Historical Aerial Photo Resources 
Census
United States Census Bureau's - Gazetteer
United States Census Bureau's - American Fact Finder
United States Census Demographic Information for Sonoma County (includes 2010 Census Tract Reference Maps)
GIS Related Websites
California Natural Diversity Database (CNDDB)
California Spatial Information Library (CASIL)
Federal Emergency Management Agency (FEMA)
FEMA Map Information eXchange (FMIX)
FEMA Online Letter of Map Change (LOMC) Application (Online LOMC Fact Sheet )
Local Agency Formation Commission (LAFCO)
National Resources Conservation Service (NRCS)
State of California Department of Conservation (DOC)
United States Geological Survey (USGS)
These documents are saved in Adobe Acrobat format.
Visit our download page for a free copy of Acrobat Reader.
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