Explore Aliso Viejo local geography, civic resources and voter guides, with dated official population and registration facts for Orange County.
At a glance: Aliso Viejo is an incorporated city in Orange County. Population: 49,945 (California Department of Finance estimate as of January 1, 2026). Registered voters: 33,160 (California Secretary of State, as of September 4, 2026).
Aliso Viejo’s municipal history is recent, but the community’s story predates cityhood. In its September 2026 history feature, the city records incorporation in 2001 and brings together accounts from community leaders and local historians. That distinction between the development of a place and the creation of its city government is an important part of its identity in southern Orange County. Aliso Viejo Ranch is a named community destination on the city’s current website, alongside recreation classes and public events. The city also highlights Orange County Public Libraries’ mobile library service at Iglesia Park. A county library service offered in a city park remains a county service; its location does not make it a municipal library department. The official city site provides separate access to council agendas and minutes, public records, major projects and permits. For a proposal affecting a property, follow the relevant project and adopted records rather than relying on the city’s anniversary story. Local history supplies context while current municipal resources show the decisions and services available now.
The city’s September 2026 history feature records incorporation in 2001, while explaining that the community’s story began earlier.
The city identifies Orange County Public Libraries as the provider. A service operating at a city location can still be county-managed.
The official city website links agendas and minutes, public records, permits and major projects as separate resources.
33,160 (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.