Piedmont is a small city located in Alameda County, California, United States, enclaved by the city of Oakland. Its residential population wa…Piedmont is a small city located 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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