Petroleum has yet to put a famous person on the list
No town in Indiana lists more than Gary, with 68. Muncie has the second-longest list in Indiana, after Gary, with 68. Famous people are on record for 426 of the towns in Indiana.
Who’s listed here
Famous people come from Wikidata (people whose birthplace is Petroleum), checked against each person’s English Wikipedia article and ranked by how many Wikipedia languages cover them. Nobody born in Petroleum has passed that check yet, and nobody born within 35 miles is listed.
From Wikidata and Wikipedia: people whose birthplace is Petroleum 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.