Clifford Dwight Waldo
1913–2000American political scientist
Each edition grades its towns against each other only.
The best known is the American political scientist Clifford Dwight Waldo, with articles in 6 languages. The list has one more: the American psychologist Harry L. Hollingworth. The oldest name on the list belongs to Harry L. Hollingworth, born in 1880, the newest to Clifford Dwight Waldo, born in 1913. Famous people are on record for 246 of the towns in Nebraska.

American political scientist
#2American psychologist
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From Wikidata and Wikipedia: people whose birthplace is De Witt 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.