A person who resides in a particular place, often used in official or formal contexts such as registration, surveys, or community notices.
Residents of this area, please participate in next month's disaster drill.
Compound of 在住 (ざいじゅう, 'residing') + 者 (しゃ, 'person'). 在住 is itself from 在 (ざい, 'to exist' or 'to be in a place') and 住 (じゅう, 'to live').