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The local ZIP code regions are known to Reservation residents and map reasonably well to watersheds: Pryor and South Billings ZIP codes are in the Pryor Creek Hydrologic Unit (HU); Fort Smith, St. Xavier and Hardin fall within the Bighorn Lake and River HU; and the Wyola, Lodge Grass, Garryowen and Crow Agency ZIP codes comprise the Montana portion of the Little Bighorn River HU.
