The San Bernardino LAFCO has taken a community-by-community approach as its policy directive in establishing and updating spheres of influence. This practice of looking at a total area also considers the existence of inter-related economic, environmental, geographic, and social interests, and attempts to harmonize the conflicting plans and services of the various service entities within a defined community.

The Service Review and Sphere Updates for the Mountain region are defined by the following communities: In addition, San Bernardino LAFCO has chosen to consider the provision of road maintenance and snow removal services on the mountain on a regional approach: