Try out our new map viewer for cities and special districts in Stanislaus County. The map uses ArcGIS Online and relies on all our favorite LAFCO data. This is a new feature that we will be regularly improving and updating.

City Sphere of Influence Maps
LAFCO staff updates Sphere of Influence Maps for each city as changes occur and to reflect current city limit boundaries.  If you have any questions regarding a specific area, please contact our office.

Sphere of Influence (SOI) = Plan for the probable physical boundaries and service area of a local agency (within a 20 year period).
Primary Area = Area around a local agency within which territory is eligible for annexation within a 0-10 year period.

Ceres - SOI Adopted February 22, 2012

Hughson - SOI Adopted September 23, 2009

Modesto - SOI Adopted December 1, 2010

Newman - SOI Adopted January 28, 2009

Oakdale - SOI Adopted July 22, 2015

Patterson - SOI Adopted December 4, 2013

Riverbank - SOI Adopted July 27, 2016

Turlock - SOI Adopted August 28, 2019

Waterford - SOI Adopted August 22, 2007

Special Districts Sphere of Influence Maps
Special districts are local agencies that provide public services such as fire protection, sewers, water, and storm drainage.  California has over 3,300 special districts.  Stanislaus County has 74 of these districts, each with its own LAFCO-adopted Sphere of Influence.
Click here to view a list of Special Districts and maps of each.
(Note:  This list only includes those special districts which Stanislaus LAFCO is the principal LAFCO.  Although other districts may overlap into Stanislaus County, the principal county is that which holds the majority of the assessed value.)

Reports of Interest:
- View the City Spheres of Influence Report  (as of June 24, 2020): A report prepared by LAFCO staff for the Commission that includes a chart summarizing city spheres, maps detailing their history, and important farmlands within and around the spheres.                                                 

- View the 2017 Islands Report  (as of February 22, 2017): A report summarizing unincorporated islands and other areas surrounded by city limits, along with recent legislation affecting annexations in these areas.   

Annual City Annexation Summary
LAFCO staff compiles data for each city in January summarizing annexations that have occurred in the previous year, as well as those in the past decade.
- View the 50-Year Summary (with information as of Dec. 31, 2010)
- View the 2019 Update (chart with updated data as of Dec. 31, 2019)

LAFCO History
Learn more about how Local Agency Formation Commissions were created and the role of Stanislaus LAFCO.