NOTE: Gray indicates insufficient data or a suppressed estimate.
Rural zip codes across Montana's eastern plains and northern tier generally exhibit higher married-couple household percentages, frequently reaching 70–80%, consistent with agricultural communities where family-operated ranches predominate. In contrast, zip codes encompassing urban centers such as Missoula, Great Falls, Billings, and several tribal reservation areas in the north-central and southeastern portions of the state display notably lower rates, often falling below 40%, appearing as dark purple clusters amid the surrounding higher-value regions. The western mountain corridor shows considerable heterogeneity, with adjacent zip codes sometimes differing by 20–30 percentage points, likely reflecting the mix of resort towns, university communities, and more rural residential areas.
Data: U.S. Census Bureau, 2023 ACS
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