Dewey has no famous person on record yet
93 of the towns in Montana list at least one person. The longest list of any town in Montana belongs to Missoula, with 70. Billings has the second-longest list in Montana, after Missoula, with 65.
Who’s listed here
Famous people come from Wikidata (people whose birthplace is Dewey), checked against each person’s English Wikipedia article and ranked by how many Wikipedia languages cover them. Nobody born in Dewey has passed that check yet, and nobody born within 35 miles is listed.
From Wikidata and Wikipedia: people whose birthplace is Dewey and whose English Wikipedia article agrees, ranked by how many Wikipedia languages cover each person. People known mainly for crimes, and adult performers, aren’t listed. “The usual town” = everyone born in the towns gathered so far.