Piedmont is a small city in Alameda County, California, United States, enclaved by the city of Oakland. Its residential population was 11,270 at the 2020 census. The name comes from the region of Piedmont in Italy, and it means 'foothill'. Piedmont was incorporated in 1907, and was developed significantly in the 1920s and 1930s.
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👉 Piedmont, California in the context of California's 12th congressional district
California's 12th congressional district is a congressional district in northern California. Lateefah Simon, a Democrat, has represented the district since January 2025. The district was represented previously by longtime congresswoman Barbara Lee, former Speaker of the House of Representatives Nancy Pelosi (who has since been redistricted to the 11th district), and former president of the United States Richard Nixon.
Currently, the 12th district is located in Alameda County and encompasses the cities of Oakland, Berkeley, Emeryville, Alameda, Albany, Piedmont, and most of San Leandro. With a Cook Partisan Voter Index rating of D+39, the 12th district is the most Democratic district in California, giving nearly 85% of its vote to Kamala Harris in the 2024 presidential election.
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Piedmont, California in the context of Key System
The Key System (or Key Route) was a privately owned company that provided mass transit in the cities of Oakland, Berkeley, Alameda, Emeryville, Piedmont, San Leandro, Richmond, Albany, and El Cerrito in the eastern San Francisco Bay Area from 1903 until 1960, when it was sold to a newly formed public agency, AC Transit. The Key System consisted of local streetcar and bus lines in the East Bay, and commuter rail and bus lines connecting the East Bay to San Francisco by a ferry pier on San Francisco Bay, later via the lower deck of the Bay Bridge. At its height during the 1940s, the Key System had over 66 miles (106 km) of track. The local streetcars were discontinued in 1948 and the commuter trains to San Francisco were discontinued in 1958. The Key System's territory is today served by BART and AC Transit bus service.