Regency in Central Java Grobogan Regency Kabupaten Grobogan Regency Coat of arms Motto(s): Grobogan Bersemi Province Central Java Capital Purwodadi Government • Regent Sri Sumarni Area • Total 2,022.25 km2 (780.80 sq mi) Population (2020 census) • Total 1,453,526 • Density 720/km2 (1,900/sq mi) [1] Demographics • Ethnic groups Javanese, Chinese • Religion Islam, Christian, Hindu, Buddhism and traditional Javanese beliefs • Languages Indonesian, Javanese Time zone WIB (UTC+7) Area code(s) +62 292 Website grobogan.go.id