Explore Walnut local geography, civic resources and voter guides, with dated official population and registration facts for Los Angeles County.
At a glance: Walnut is an incorporated city in Los Angeles County. Population: 28,623 (California Department of Finance estimate as of January 1, 2026). Registered voters: 19,599 (California Secretary of State, as of September 4, 2026).
Walnut occupies rolling terrain in the eastern San Gabriel Valley. Residential neighborhoods, ridgelines, and trails give much of the city a less intensely urban appearance than nearby freeway-oriented commercial centers. Suzanne Park, Creekside Park, and the Walnut Senior Center provide municipal recreation and gathering places. Mt. San Antonio College is a separate educational institution in the community, not a department of city government. Walnut incorporated on January 19, 1959, as a general-law city. Its council-manager structure places policy with the elected council and daily administration with an appointed city manager; the council chooses a member to serve as mayor.
The city's facts page states that the council selects one of its members to serve a one-year mayoral term.
No. It is a community college governed separately from the municipality.
Walnut's Community Services Department provides recreation, youth enrichment, senior services, and community events.
19,599 (California Secretary of State, as of September 4, 2026).
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