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Share of households with a member under 18 (Census basis). A gauge of how many child-rearing families live nearby.
Source: e-Stat — 2020 Population Census, Basic Tabulation on Population
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▲ The top 5 are tinted sky, ▼ the bottom 5 amber. Ties share a rank (standard competition ranking).
The same metric at prefecture level lives at /ranking/muni_childrearing_household_share. For each municipality’s trend and detail, open its page from the municipality index.
Note: trend charts live on each municipality page (/municipality/{code}). This page does one thing — line up the whole country on a single axis.