Rockwell has yet to put a famous person on the list
No town in Iowa lists more than Waterloo, with 61. After Waterloo, the next longest list in Iowa is Iowa City’s, with 54. In all of Iowa, the famous people on record come from 455 towns.
Who’s listed here
Famous people come from Wikidata (people whose birthplace is Rockwell), checked against each person’s English Wikipedia article and ranked by how many Wikipedia languages cover them. Nobody born in Rockwell has passed that check yet, and nobody born within 35 miles is listed.
From Wikidata and Wikipedia: people whose birthplace is Rockwell 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.