1010 10th Street, 3rd Floor
Modesto, CA 95354
Phone: 209.525.7660
Fax: 209.525.7643

Information & Maps

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 September 26, 2007

Waterford
- SOI Adopted August 22, 2007

LAFCO staff prepared a report for the Commission that includes a chart summarizing city spheres, maps detailing their history, and important farmlands within and around the spheres.
- View the City Spheres of Influence Report  (as of March 26, 2014)

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.)

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 2012 Update (chart with updated data as of Dec. 31, 2012)
- View the 2014 Update (chart with updated data as of Dec. 31, 2014)
- View the 2015 Update (chart with updated data as of Dec. 31, 2015)

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


How to View PDFs

To view LAFCO documents you need to have Adobe Acrobat 8+ or Adobe Acrobat Reader 8+ installed on your machine. If you do not have either one please go to www.adobe.com After downloading and installing Acrobat Reader you should be able to view all documents on LAFCO's website.  If you are still unable to view, call us at (209) 525-7660 or E-Mail Sara.
       Stanislaus LAFCO