The Aboriginal Population of Alameda and Contra Costa Counties, California

This volume offers a close‑up look at the native peoples who once lived along the east shore of San Francisco Bay, covering the area now known as Alameda and Contra Costa counties. The author builds on earlier studies of California’s indigenous populations, adding fresh ecological and demographic analysis for a region that fell within the Costanoan linguistic sphere. By weaving together early Spanish expedition reports, mission records, and archaeological findings, the work paints a picture of village life, resource use, and the challenges posed by early colonial contact between 1770 and 1820.

Included are full translations of several little‑known documents—such as the Cañizares exploration, Father Danti’s diary, and Sergeant Amador’s notes—alongside detailed maps that locate the principal tribal groups and known habitation sites. Population estimates are presented with clear explanations of the source material, giving listeners a solid foundation for understanding the scale and organization of these societies. The narrative remains scholarly yet accessible, making it a valuable guide for anyone curious about the early history and ecology of California’s East Bay peoples.