No one from Duncan is on the famous people list yet
The longest list of any town in Iowa belongs to Waterloo, with 61. After Waterloo, the next longest list in Iowa is Iowa City’s, with 54. 471 of the towns in Iowa list at least one person.
Who’s listed here
Famous people come from Wikidata (people whose birthplace is Duncan), checked against each person’s English Wikipedia article and ranked by how many Wikipedia languages cover them. Nobody born in Duncan has passed that check yet, and nobody born within 35 miles is listed.
From Wikidata and Wikipedia: people whose birthplace is Duncan 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.