On Lok is a not-for-profit organization founded in the early 1970s by a group of citizens concerned about the plight of frail elders and the lack of long-term options in the community. On Lok provides quality and affordable services for the well-being of San Francisco's elderly and their caregivers.

Now, several decades later, On Lok serves seniors in the community through:

On Lok SeniorHealth—a comprehensive health plan that provides long-term care for eligible seniors living in San Francisco and Fremont, CA. The program offers full medical care and support services with the goal of helping seniors live at home and in the community for as long as possible.

30th Street Senior Services—the largest multi-purpose senior center in San Francisco offering a broad range of programs including a senior center, nutrition and congregate meals, home delivered meals and bilingual case management.

On Lok Intergenerational Program—a program that brings together On Lok SeniorHealth members and children from neighboring childcare centers and elementary schools.

Housing—three buildings with various types of residential units for older adults.