The study demonstrates the realization of sextuple polarization states and interstate switching in antiferroelectric van der Waals material CuInP₂S₆. The researchers experimentally show that CuInP₂S₆ films can be controllably stabilized into double, quadruple, and sextuple polarization states, with the system also reversibly tunable between these states. Mutual interstate switching is achieved via moderate electric field modulation. First-principles studies reveal that these states are attributed to the existence of single, double, and triple ferroelectric domains with antiferroelectric interdomain coupling and Cu ion migration. This work offers promising platforms for developing multistate ferroelectric devices and provides transformative insights into other non-volatile material systems. The findings highlight the potential of 2D ferroelectric materials like CuInP₂S₆ for high-density storage devices and beyond-Moore technologies.The study demonstrates the realization of sextuple polarization states and interstate switching in antiferroelectric van der Waals material CuInP₂S₆. The researchers experimentally show that CuInP₂S₆ films can be controllably stabilized into double, quadruple, and sextuple polarization states, with the system also reversibly tunable between these states. Mutual interstate switching is achieved via moderate electric field modulation. First-principles studies reveal that these states are attributed to the existence of single, double, and triple ferroelectric domains with antiferroelectric interdomain coupling and Cu ion migration. This work offers promising platforms for developing multistate ferroelectric devices and provides transformative insights into other non-volatile material systems. The findings highlight the potential of 2D ferroelectric materials like CuInP₂S₆ for high-density storage devices and beyond-Moore technologies.