At the 2010 Census, the regency was divided into nine districts (kecamatan). Subsequently, three additional districts were created by the division of existing districts (Barumun Selatan created from part of Barumun District; Aek Nabara Barumun, and Sihapas Barumun from parts of Barumun Tengah). In 2019 a further five districts were created, although the populations of these areas at the 2010 Census are still included in the districts from which they were cut. The districts are tabulated below with their areas and their populations at the 2010 Census[2] and the 2020 Census,[3] together with the official estimates as of mid-2024.[1] The table also includes the locations of the district administrative centres, the number of administrative villages in each district (totaling 303 rural desa and a single urban kelurahan), and its postcode.
Kode
Wilayah | Name of
District
(kecamatan) | Area
in
km2 | Pop'n
Census
2010 | Pop'n
Census
2020 | Pop'n
Estimate
mid 2024 | Admin
centre | No.
of
villages | Post
code |
| 12.21.01 | Sosopan | 435.18 | 9,186 | 10,389 | 11,047 | Sosopan | 12 | 22761 |
| 12.21.06 | Ulu Barumun | 207.43 | 14,024 | 16,700 | 18,115 | Paringgonan | 15 | 22767 |
| 12.21.07 | Barumun | 126.10 | 44,040 | 40,934 | 44,640 | Pasar Sibuhuan | 17 (a) | 22763 |
| 12.21.13 | Barumun Baru | 13.73 | (b) | 12,266 | 13,385 | Hasahatan Julu | 13 | 22763 |
| 12.21.10 | Barumun Selatan
(South Barumun) | 109.87 | 6,780 | 7,954 | 8,578 | Batang Bulu Lama | 11 | 22764 |
| 12.21.04 | Lubuk Barumun | 289.58 | 16,201 | 20,024 | 22,036 | Pasar Latong | 24 | 22766 |
| 12.21.08 | Sosa | 283.52 | 31,765 | 19,487 | 21,631 | Pasar Ujung Batu | 16 | 22765 |
| 12.21.14 | Ulu Sosa | 211.67 | (c) | 9,076 | 9,607 | Hapung | 11 | 22765 |
| 12.21.15 | Sosa Julu | 155.95 | (c) | 10,295 | 11,384 | Hurung Jilok | 12 | 22765 |
| 12.21.17 | Sosa Timur
(East Sosa) | 159.55 | (d) | 8,623 | 8,856 | Tanjung Ale | 13 | 22742
& 22776 |
| 12.21.09 | Batang Lubu Sutam | 184.75 | 11,990 | 8,113 | 8,451 | Pinarik | 20 | 22742 |
| 12.21.05 | Huta Raja Tinggi | 663.24 | 39,575 | 39,252 | 41,501 | Huta Raja Tinggi | 26 | 22776 |
| 12.21.03 | Huristak | 523.59 | 19,794 | 18,652 | 19,156 | Pasar Huristak | 27 | 22743 |
| 12.21.02 | Barumun Tengah
(Central Barumun) | 119.40 | 18,153 | 16,307 | 17,089 | Padang Hasior | 21 | 22755 |
| 12.21.11 | Aek Nabara Barumun | 329.36 | 10,725 | 13,107 | 14,361 | Aek Nabara | 25 | 22755 |
| 12.21.12 | Sihapas Barumun | 48.25 | 4,574 | 5,685 | 6,269 | Padang Hasior | 13 | 22755 |
| 12.21.16 | Barumun Barat
(West Barumun) | 51.01 | (e) | 4,147 | 4,658 | Aek Nabara | 10 | 22755 |
| Totals | 3,912.18 | 226,807 | 261,011 | 280,764 | Pasar Sibuhuan | 304 | |
|
Notes: (a) including Pasar Sibuhuan, the sole town (kelurahan) in the regency, with 22,136 inhabitants (half of the Barumun District total) as at mid 2023.
(b) the 2010 Census population of the new Barumun Baru District is included in the figure for the Barumun District, from which it was cut out in 2019.[3]
(c) the 2010 Census populations of the new Sosa Julu and Ulu Sosa Districts are included in the figure for the Sosa District, from which they were cut out in 2019.[3]
(d) the 2010 Census populations of the new Sosa Timur District are included in the figures for the Batang Lubu Sutam and Hutaraja Tinggi Districts, from which it was cut out in 2019.[3]
(e) the 2010 Census populations of the new Barumun Barut District are included in the figure for the Barumun Tengah District, from which it was cut out in 2019.[3]
