Oddly enough, I don't think the town and the street refer to the same Grinnell.
Grinnell was founded as a "Yankee" town, by settlers from New England descended from the English Puritans in the 1600s.[5][6] Grinnell was founded in 1854 by four men: Josiah B. Grinnell, a Congregationalist from Vermont; Homer Hamlin, a minister; Henry Hamilton, a surveyor; and Dr. Thomas Holyoke.[7] The city was to be named "Stella," but J.B. Grinnell convinced the others to adopt his name...
It the Dakotas anything named "GRINNELL" likely refers to George Grinnell.
George Bird Grinnell (September 20, 1849 – April 11, 1938) was an American anthropologist, historian, naturalist, and writer. Grinnell was born in Brooklyn, New York, and graduated from Yale University with a B.A. in 1870 and a Ph.D. in 1880. Originally specializing in zoology, he became a prominent early conservationist and student of Native American life. Grinnell has been recognized for his influence on public opinion and work on legislation to preserve the American bison. Mount Grinnell is named after Grinnell.
And there's your useless Midwest trivia for the day.
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It the Dakotas anything named "GRINNELL" likely refers to George Grinnell.