This polygon shapefile contains spheres of influence in Placer County, Calfornia. Special district spheres of influence define the probable physical boundaries and service area of a local agency. This layer is part of a collection of public geospatial datasets produced by the Placer County GIS Division. Placer County Geographic Information Systems. (2020). Spheres of Influence, Placer County, California, 2020. Placer County Geographic Information Systems. Available at: https://purl.stanford.edu/cq098hh3942 This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.