NOTE: Gray indicates insufficient data or a suppressed estimate.
Urban cores in the Seattle-Tacoma metropolitan area along the Puget Sound display notably lower married-couple household rates, with many zip codes falling below 30–40%, consistent with higher concentrations of single-person households and non-family living arrangements in dense city centers. In contrast, suburban and exurban zip codes east of the Cascades and in rural eastern Washington generally cluster in the 50–70% range, with scattered zip codes exceeding 80%—likely small, family-oriented agricultural communities. A distinct east-west gradient is visible, though pockets of very low married-couple percentages also appear in central Washington around college towns and tribal reservation areas.
Data: U.S. Census Bureau, 2023 ACS
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