Định Quán is a rural district of Đồng Nai province in the Southeast region of Vietnam. As of 2019 the district had a population of 187,306. The …Định Quán is a rural district of Đồng Nai province in the Southeast region of Vietnam. As of 2019 the district had a population of 187,306. The district covers an area of 967 km². The district capital lies at Định Quán.