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Place List: Contra Costa County, CA, sorted alphabetically (number of total localities in parentheses):
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1. Concord, Contra Costa County, CA
2. Contra Costa County, CA
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3. El Sobrante, Contra Costa County, CA
4. Martinez, Contra Costa County, CA
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5. New York Landing (Pittsburg), Contra Costa County, CA
6. Richmond, Contra Costa County, CA
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