NOTE: Gray indicates insufficient data or a suppressed estimate.
University towns and military installations drive the youngest median ages in the state, with deep purple clusters visible around Pullman (WSU), Ellensburg (CWU), and the Yakima Training Center area in south-central Washington, where median ages dip below 25. The Seattle-Tacoma metro corridor displays moderate median ages in the 30s–low 40s, contrasting sharply with the yellow-shaded rural and retirement-oriented zip codes along the San Juan Islands, parts of the Olympic Peninsula coast, and scattered agricultural communities in north-central Washington where median ages exceed 55. Eastern Washington exhibits the greatest intra-regional variability, with college-town zip codes sitting immediately adjacent to aging rural communities, creating a patchwork of extremes not seen in the more uniformly moderate western urban core.
Data: U.S. Census Bureau, 2023 ACS
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