Sinjai Regency
Sinjai Regency is a regency of the South Sulawesi province of Indonesia. The regency, which is separated from the Bone Regency to its north by the River Tangka, covers an area of 819.96 km2. It had a population of 228,936 at the 2010 census and 259,478 at the 2020 census. The official estimate of population as of mid-2024 was 273,559. It includes the Nine Islands in the Gulf of Bone off the east coast of the southern peninsula of Sulawesi; this archipelago forms an administrative district within the regency. The regency's principal town lies at Sinjai, a port situated on the east coast of that peninsula.
Sembilan Islands (''Pulau Sembilan'')
The small group of mountainous, forest-covered islands known as the Sembilan Islands lies on the east coast of South Sulawesi province and is northeast of the port town of Sinjai. Notwithstanding the name, ten named islands are forming the group, as Pulau Kanalosatu and Pulau Kanalodua are structurally linked and normally classed as one island. There are four administrative desa within the district.In the south, the desa of Pulau Buhung Pitue covers the island of Pulau Burungloe. To the northeast, the desa of Pulau Harapan covers the islands of Pulau Liangliang and Pulau Kambuno. Further north is the desa of Pulau Padaelo, which covers the island of Pulau Kodingare. Finally, north and west of Pulau Kodingare, the desa of Pulau Persetuan covers the islands of Pulau Batanglampe, Pulau Kanalosatu, Pulau Kanalodua, Pulau Katindoang, Pulau Lapoipoi and Pulau Larearea.
Administrative districts
The regency is divided into nine districts, tabulated below with their areas and their populations at the 2010 Census and the 2020 Census, together with the official estimates as of mid-2023. The table also includes the locations of the district administrative centers, the number of administrative villages in each district, and their postcode.| Kode Wilayah | Name of District | Area in kn2 | Pop'n Census 2010 | Pop'n Census 2020 | Pop'n Estimate mid 2023 | Admin centre | No. of villages | Post code | |
| 73.07.01 | Sinjai Barat | 135.53 | 22,985 | 25,873 | 27,193 | Tassililu | 9 | 92653 | |
| 73.07.07 | Sinjai Borong | 66.97 | 15,901 | 17,718 | 18,888 | Pasir Putih | 8 | 92662 | |
| 73.07.02 | Sinjai Selatan | 131.99 | 37,055 | 40,473 | 42,032 | Bikeru | 11 | 92661 | |
| 73.07.08 | Tellu Limpoe | 147.30 | 31,448 | 37,724 | 40,606 | Mannanti | 11 | 92681 | |
| 73.07.03 | Sinjai Timur | 71.88 | 28,971 | 33,765 | 36,200 | Samataring | 13 | 92671 | |
| 73.07.04 | Sinjai Tengah | 129.70 | 25,966 | 28,337 | 29,572 | Samaenre | 11 | 92652 | |
| 73.07.05 | Sinjai Utara | 29.57 | 43,467 | 50,498 | 52,552 | Balingnipa | 6 | 92611 - 92616 | |
| 73.07.06 | Bulupoddo | 99.47 | 15,681 | 17,522 | 18,470 | Lamatti Riattang | 7 | 92654 | |
| 73.07.09 | Pulau Sembilan | 7.55 | 7,405 | 7,568 | 8,046 | Pulau Harapan | 4 | 92616 | |
| Totals | 819.96 | 228,879 | 259,478 | 273,559 | Sinjai | 80 |
Notes: including 2 kelurahan. including one kelurahan. all 6 are kelurahan.