It now has an area of 5,087.07 km2 and had a population of 205,272 at the 2010 census[2] and 229,813 at the 2020 census;[3] the official estimate as at mid 2023 was 236,727 (comprising 120,615 males and 116,112 females).

[1] The regency's administrative capital lies at the town of Muara Sabak, a riverine port near the mouth of the Berbak River.

The regency is divided into eleven districts (kecamatan), tabulated below with their areas and their populations at the 2010 census[2] and the 2020 census.

[4] The table also includes the locations of the district administrative centres, the number of administrative villages in each district (totaling 73 rural desa and 20 urban kelurahan), and its post code.

The 20 kelurahan comprise all 7 in Muara Sabak Barat District (Kampung Singkep, Nibung Putih, Parit Culum I, Parit Culum II, Rano, Talang Babat and Telukdawan), 2 in Muara Sabak Timur District (Muara Sabak Ilir and Muara Sabak Ulu), 2 in Kuala Jambi District (Kampung Laut and Tanjung Solok), 2 in Nipah Panjang District (Nipah Panjang I and Nipah Panjang II), and 1 in each of the other 7 districts.