Within text, the LLC (or Corp or Inc) should be omitted: Dan Hart Patrol Service is a limited liability company.
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Anonymousbut lawyers don't go by normal rules. So ... should a comma go after it or not?In that case, don't bother with one.
Chicago Manual of Style says to include commas before and after "LLC" in running text. https://www.chicagomanualofstyle.org/qanda/data/faq/topics/Commas.html