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There are a whole bunch of medical clinics around 321 in Miami-Dade County according to the US Census data - they call it County Business Patterns. I pulled ten from OpenStreetMap, just for you; six of them have phone numbers listed. It’s interesting that all six also link to websites! These listings are totally free, by the way. If you're a business owner and want to check things out or claim your page, you can find it on hashtag.org.
Data: © OpenStreetMap contributors