South Labuhanbatu Regency
South Labuhanbatu Regency is a regency of North Sumatra Province of Indonesia, created on 21 July 2008 by being carved out of the southern districts of the existing Labuhanbatu Regency. The new South Labuhanbatu Regency covers an area of 3,051.82 square kilometres and according to the 2010 census it had a population of 277,673, which rose to 314,094 at the 2020 Census; the official estimate as at mid 2024 was 336,577. Its administrative headquarters are at the town of Kotapinang.
Administrative districts
The regency is divided administratively into five districts, tabulated below with their areas and their populations at the 2010 Census and the 2020 Census, together with the official estimates as at mid 2024. The table also includes the location of the district centres, the number of administrative villages in each district, and its post code.| Kode Wilayah | Name of District | Area in km2 | Pop'n Census 2010 | Pop'n Census 2020 | Pop'n Estimate mid 2024 | Admin centre | No. of villages | Post code |
| 12.22.04 | Sungai Kanan | 486.91 | 45,407 | 48,447 | 50,729 | Langga Payung | 9 | 21465 |
| 12.22.03 | Torgamba | 1,241.40 | 99,010 | 109,970 | 116,953 | Aek Batu | 14 | 21466 |
| 12.22.01 | Kotapinang | 342.50 | 53,954 | 64,455 | 70,507 | Kotapinang | 10 | 21464 |
| 12.22.05 | Silangkitang | 217.27 | 28,282 | 30,728 | 32,402 | Aek Goti | 6 | 21461 |
| 12.22.02 | Kampung Rakyat | 763/74 | 51,020 | 60,494 | 65,984 | Tanjung Medan | 15 | 21463 |
| Totals | 3,051.82 | 277,673 | 314,094 | 336,577 | Kotapinang | 54 | - |
Note: including the kelurahan of Langga Payung, with 11,811 inhabitants as at mid 2023.
while not classed as an urban kelurahan, the desa with the largest population in mid 2023 is Aek Batu, with 27,721 inhabitants.
including the kelurahan of Kotapinang, with 24,575 inhabitants as at mid 2023.