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How they count businesses? The US Census - County Business Patterns says there are 125 insurance agencies in Jefferson County, TX. I looked up five of them using OpenStreetMap. Three have phone numbers listed; two even put a website link on their page. You can find them all for free, and if you own one of these businesses, you can claim your listing at hashtag.org. It's pretty straightforward.
Data: © OpenStreetMap contributors