San Ramon Valley
The valley's population is around 130,000 people.
The cities of San Ramon, Danville and Alamo as well as the southern edge of Walnut Creek are located in the valley, as are the census-designated places (CDPs) of Camino Tassajara, Blackhawk and Diablo.
Interstate 680 serves as the primary transportation route for the area.
- Rancho San Ramon (Pacheco-Castro) — 19th century Mexican rancho of the northern valley.
- Rancho San Ramon (Amador) — 19th century Mexican rancho of the southern valley.
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