I found some lists for some states, e.g. https://georgia.gov/municipality-list, but not for all counties in the US...
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One way to find open data is to search this site ! – user4293 Sep 11 '17 at 21:23
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geonames.org should have this – Barry Carter Sep 13 '17 at 15:26
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2Possible duplicate of U.S. City and County Web Data (API) – Joe Germuska Feb 12 '19 at 20:02
