Margery C. Carlson
1892–1985U.S. botanist and conservationist
Each edition grades its towns against each other only.
Margery C. Carlson is the best known, with articles in 8 languages. The only other name is the American politician Hugh M. Rigney. From Hugh M. Rigney to Margery C. Carlson, the births on the list run from 1873 to 1892. The longest list of any town in Illinois belongs to Alton, with 65.

U.S. botanist and conservationist
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From Wikidata and Wikipedia: people whose birthplace is Arthur 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.