Map Viewer with HTML5
View more than 100 map layers including property boundaries, hazards, jurisdictions and natural features. Query by address or Assessor Parcel Number.  Print maps.  Best viewed using current versions of Internet Explorer, FireFox and Google Chrome.  Also runs in smart phone and tablet browsers!
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FEMA Flood Information
Enter Assessor parcel number (found on your property tax bill) or street address to view FEMA flood maps as well as any nearby properties that have been removed from FEMA’s flood hazard zones via a successful Letter of Map Change.
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Road Moratorium
View streets that have prohibitions on planned excavations for a specified time, typically five years. More...

Map Viewer with extended toolkit
Using Microsoft's "Silverlight" web browser plug in, this app offers many additional tools for digital maps including buffering, selection, and adding map services. Your browser must have this plug in installed and enabled.  This webapp will not run in Google Chrome browser. More...

LAFCO Change Areas
LAFCO = Local Agency Formation Commission.
View city and special district boundaries with a focus on changes to those boundaries. Linked to the map entities is access to the official agency documents relating to formation, addition, removal and dissolution of agency boundaries. More...

Ortho Aerial Image Download
This application is used to download Orthographic Imagery from 2004, 2011 or 2014.  It allows you to clip or Export a Map to a downloadable image file OR include georeference data to import the image into  a mapping program. More...

Street lights
View street light locations.  Marin General Services Authority contracts with DC Electric Group for streetlight maintenance. Report outages to DC Electric using the application.
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Benchmarks
Local benchmarks denoting elevation plus National Geodetic Survey geodetic control stations that provide a base of reference for latitude, longitude and height throughout the United States. More...