In the wake of the 1948 Arab–Israeli War, and after the 1949 Armistice Agreements, Illar came under Jordanian rule. In 1961, the population of Illar was 2,499. Since the Six-Day War in 1967, Illar has been under Israeli occupation. After Oslo II Accord in 1995, Illar was placed under Area A of the West Bank under security and civil administration of the Palestinian National Authority.