Eugene Peter Knudsen
1915–1981American politician – Minnesota -House 1955-62 (District 25); Senate 1963-66 (District 23)
Each edition grades its towns against each other only.
Theodore Schultz is the most widely known, written about in 60 languages. Closest of all is Eugene Peter Knudsen, from Badger, 8 mi away. So far, no famous person on record was born in Lake Poinsett. Famous people are on record for 167 of the towns in South Dakota.

Nobody born in Lake Poinsett is confirmed by English Wikipedia yet. These are the best known born within 35 miles.
American politician – Minnesota -House 1955-62 (District 25); Senate 1963-66 (District 23)

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Be the first to say who Lake Poinsett’s most famous person is.
From Wikidata and Wikipedia: people whose birthplace is Lake Poinsett and whose English Wikipedia article agrees, ranked by how many Wikipedia languages cover each person. Nearby people are those born in a town within 35 miles; distances are town center to town center. People known mainly for crimes, and adult performers, aren’t listed. “The usual town” = everyone born in the towns gathered so far.