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government office; public office
「役所」 has another reading with different meanings.
住民票を取りに役所へ行ってきた。
I went to the government office to get a residence certificate.
役所の窓口は五時で閉まってしまいます。
The government office counter closes at 5 o'clock.
引っ越したら役所で届け出が必要だ。
You need to file a notice at the office when you move.