{"small_area_id":"12219042202","area_code":"12219","name":"五井","population":3086,"households":1443,"elementary":{"assignment":"split","primary_school_code":"B112210004565","primary_school_name":"市原市立若葉小学校","area_shares":[{"code":"B112210004565","share":0.5806},{"code":"B112210004379","share":0.4107},{"code":"B112210004404","share":0.0087}],"data_year":2023,"last_verified_at":"2026-10-16T04:41:58.368Z","source_attribution":null},"junior_high":{"assignment":"split","primary_school_code":"C112210002208","primary_school_name":"市原市立若葉中学校","area_shares":[{"code":"C112210002208","share":0.5806},{"code":"C112210002119","share":0.4194}],"data_year":2023,"last_verified_at":"2026-10-16T04:41:58.368Z","source_attribution":null},"note":"学区は国土数値情報の学区ポリゴンと町丁目の重なりから機械で判定。通学先は教育委員会で確認してください。","attribution":"国土数値情報（小学校区・中学校区データ）、e-Stat 境界データ（小地域）、文部科学省「学校コード」を加工して作成（学区DB）"}