California’s 12th Congressional District encompasses most of the City of San Francisco, and is one of the most solidly Democratic districts in the country. The district is entirely urban with a population of just over 700,000 people from a variety of ethnic and economic backgrounds. About 54% of residents are college graduates, and the median household income of the district is $69,046.

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https://ballotpedia.org/California%27s_12th_Congressional_District