Information & 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)
- View the 2017 Islands Report (as of February 22, 2017)
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)
Learn more about how Local Agency Formation Commissions were created and the role of Stanislaus LAFCO.