Williamson Act Parcel Maps

Williamson Act Program

The California Land Conservation Act of 1965, commonly referred to as the Williamson Act, enables local governments to enter into contracts with private landowners for the purpose of restricting specific parcels of land to agricultural or related open space use. In return, landowners receive property tax assessments which are much lower than normal because they are based upon farming and open space uses as opposed to full market value.

The Open Space Subvention Act of 1971 provided local governments an annual subvention of forgone property tax revenues from the state through the year 2009; these payment have been suspended in more recent years due to revenue shortfalls.

View the Land Conservation Act page of the California Department of Conservation for more information.
application thumbnail for Williamson Act Parcels

This Interactive Map showing parcels designated as Williamson Act Parcels as of today. These are parcels that are coded as '2800' in their Use Code by the County Assessor.

Historic Maps

  1. 2005 Parcels Affected By Williamson Act Small (PDF)
  2. 2008 Parcels Affected By Williamson Act (PDF)
  3. 2009 Parcels Affected By Williamson Act (PDF)
  4. 2012 Parcels Affected By Williamson Act (PDF)
  5. 2013 Parcels Affected By Williamson Act (PDF)
  6. 2014 Parcels Affected By Williamson Act (PDF)
  7. 2015 Parcels Affected By Williamson Act (PDF)
  8. 2016 Parcels Affected By Williamson Act (PDF)
  9. 2017 Parcels Affected By Williamson Act (PDF)
  10. 2005 Parcels Affected By Williamson Act (PDF)