Several parts combine into one character.

住 is a phonetic-semantic compound: 亻 (the side-form of "person") + 主 (zhǔ, "host / master" — originally a pictograph of a flame on a lamp wick). 主 provides the sound but also contributes a hint of meaning: "to be the central, anchored thing." The composite reads as "a person settled in a fixed central place" — to dwell, to reside, to stay.

Korean reading "ju." Saturates Korean administrative and everyday vocabulary: 住所 (juso, address — used on every Korean form), 住宅 (jutaek, housing / residence), 住居 (jugeo, dwelling — formal), 住民 (jumin, resident / member of a community — extremely common in Korean local government contexts), 居住 (geoju, residence / inhabitancy — note the inverted compound from 住居), 常住 (sangju, "always dwelling" = permanent residence). The (jumin deungnokjeung, "Resident Registration Card") is the standard Korean ID, and the noun 주민 derives directly from 住民.

Mandarin zhù, 4th tone. 住 (zhù), 住址 (zhùzhǐ, address), 住院 (zhùyuàn, "to dwell in hospital" = to be hospitalized — note the metaphorical extension from "live" to "be a long-term presence"), 住宿 (zhùsù, lodging). Importantly, Mandarin uses 住 as a verbal complement to mean "fixed in place / firmly held": 停住 (tíngzhù, to stop and stay), 抓住 (zhuāzhù, to grip and hold firmly), 记住 (jìzhù, to remember and not forget). The 住 complement marks completed, sustained action — a core Chinese grammatical pattern.

Japanese on-reading ジュウ (jū) — 住所 (jūsho, address — written on every Japanese form), 住宅 (jūtaku, residence / housing), 住民 (jūmin, residents). Kun-reading すむ (sumu) — 住む (sumu, to live somewhere), 住まい (sumai, residence / dwelling). Important homophone caution: すむ is also the kun-reading for 済む (to be finished / settled) and 澄む (to be clear / pure) — three different kanji, same kana, distinguished only by context. Japanese language tests love this homophone trio.

Memory aid: a person (亻) anchored at a central point like a flame on a lamp wick (主) — settled, dwelling, living.