NOTE: Gray indicates insufficient data or a suppressed estimate.
Married-couple household shares in Iowa are broadly highest—frequently exceeding 70%—in rural zip codes across the northwestern and north-central parts of the state, while the lowest concentrations (below 30–40%) cluster in and around urban centers such as Des Moines, Waterloo–Cedar Falls, Iowa City, and the Quad Cities area in the southeast. A pronounced urban-rural gradient is evident statewide, with small-town and agricultural zip codes consistently registering 60–80% married-couple households compared to core urban zip codes that often dip into the 20–40% range. Scattered pockets of very high percentages (yellow) also appear in suburban fringe areas surrounding the major metros, suggesting a ring pattern where married couples concentrate just outside city limits.
Data: U.S. Census Bureau, 2023 ACS
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