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The metro, stated precisely

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DELINEATION, COMPOSITION, AND THE SUMS VERIFIED FROM THE FILES

Osceola belongs to the South Bend–Mishawaka, IN–MI Metropolitan Statistical Area (OMB delineation, CBSA 43900, composition unchanged in the current Bulletin 23-01 delineations): St. Joseph County, Indiana, plus Cass County, Michigan — nothing else. Its 2020 population, verified by summing the two counties' counts in the PL geography files, is 324,501: St. Joseph County 272,912 plus Cass County 51,589. One disagreement prints whole: STATS Indiana's county profile prints St. Joseph's 2020 count as 272,910, two less than the PL file's 272,912; the PL figure governs here, and it is the one that reproduces the published metro total. The wider Combined Statistical Area — South Bend–Elkhart–Mishawaka, IN–MI — joins six counties: the metro's two, Elkhart County (207,047), Berrien County, Michigan (154,316), Kosciusko County (80,240) and Marshall County (46,095), for a 2020 total of 812,199, verified the same way. Osceola's share of its metro is 0.80 percent (2,590 of 324,501), and of the combined area 0.32 percent; Penn Township whole is 21.2 percent of the metro — the township is a fifth of the metropolitan population, and the town is a hundred-and-twenty-fifth of its own township. Both facts are the same fact: this build's subject is a small town inside the suburban mass of a mid-sized metro, and its population record cannot be read outside that frame.

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Source: The metro, stated precisely, Moosed History by Project Moosed, https://history.projectmoosed.com/usa/midwest/indiana/osceola/population/metro-stated-precisely/