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There are 418 insurance agencies in Contra Costa County according to the US Census, specifically from what they call the County Business Patterns. We’ve mapped 22 of them using OpenStreetMap just for reference. Six of those listings actually have a phone number listed and five include a website. They're all free listings, by the way. Anyone who owns one of these businesses can claim their page on hashtag.org.
Data: © OpenStreetMap contributors