NOTE: Gray indicates insufficient data or a suppressed estimate.
Larger household sizes of 3.0 or above cluster notably across the northeastern quadrant of Montana, particularly in zip codes associated with the Fort Peck and Fort Belknap reservation areas, as well as in scattered rural zones in the south-central part of the state near the Crow and Northern Cheyenne reservations. Urban centers such as Missoula, Great Falls, Helena, and Billings display consistently lower average household sizes in the 1.8–2.2 range, reflecting higher concentrations of single-person households and smaller living arrangements typical of college towns and metropolitan cores. The western mountain region shows moderate values generally between 2.2 and 2.8, with pockets of very low averages in resort and retirement-oriented communities.
Data: U.S. Census Bureau, 2023 ACS
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