Explore San Dimas local geography, civic resources and voter guides, with dated official population and registration facts for Los Angeles County.
At a glance: San Dimas is an incorporated city in Los Angeles County. Population: 33,915 (California Department of Finance estimate as of January 1, 2026). Registered voters: 23,839 (California Secretary of State, as of September 4, 2026).
San Dimas lies at the northeastern edge of the San Gabriel Valley, where foothill neighborhoods meet canyon terrain. Bonita Avenue's historic center and the community's equestrian routes retain visible connections to its earlier rural setting. Frank G. Bonelli Regional Park and its reservoir landscape are major outdoor resources within the city. San Dimas Canyon Park, San Dimas Canyon Golf Course, and the county library broaden the range of recreation and community facilities. San Dimas incorporated on August 4, 1960, as a general-law city with a council-manager government. Municipal policy is set by elected leadership, with a professional city manager responsible for administration.
No. Frank G. Bonelli Regional Park is a Los Angeles County regional park, although it lies within San Dimas.
The official City Staff directory lists the City Clerk and clerk staff in the Administration Department.
No. Use current City Clerk election notices and lavote.gov; the overview includes older election-calendar language.
23,839 (California Secretary of State, as of September 4, 2026).
CA Slates began with shared voter guides in 2012 and expanded into its current publication family and connected program.