18 the # of people in Sharavya’s family (sons, brothers)(Ezra 8:18)
18 Chanani got the 18th goral (Divrei Hayamim aleph 25:25)
18 Bnei Yisrael served Eglon, King of Moav, 18 years (Shoftim 3:14)
18 the amudim were 18 amos high that Chiram built for Shlomo Hamelech (Melachim aleph 7:15)
18 Yoshiyahu was 18 when he ruled J-m (Melachim bais 22:1)
18 Yehoyachin was 18 when he ruled J-m (Melachim bais 24:8)