Pinole is a city in Contra Costa County, California, United States. Its population was 19,022 at the 2020 census. The Huchiun tribe lived i…Pinole is a city in Contra Costa County, California, United States. Its population was 19,022 at the 2020 census. The Huchiun tribe lived in the region. In 1823, Ygnacio Martínez, commandant of the Presidio of San Francisco, received a land grant of Rancho El Pinole from the Mexican government. Martinez built a hacienda in Pinole Valley; this is land encompassed by Pinole Valley Park. During the 1850s, Bernardo Fernandez, a Portuguese immigrant, started a trading facility on the shores of San Pablo Bay. He built Fernandez Mansion, a historic building that still stands today at the end of Tennent Avenue. From these early beginnings, a small but thriving community developed into the city of Pinole.
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