Samosir Regency

Samosir Regency is an inland regency in North Sumatra. It was created on 18 December 2003 by splitting away the western districts of the former Toba Samosir Regency. The regency covers a land area of 1,444.25 square kilometres, including the whole of Samosir Island in the inland sea of Lake Toba. It had a population of 119,653 at the 2010 census and 136,441 at the 2020 Census; the official estimate for mid 2024 was 143,071 - comprising 71,584 males and 71,487 females. Its administrative seat is the town of Pangururan on the west coast of Samosir Island.

Administrative districts

The regency is divided administratively 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-2024. The table also includes the locations of the district administrative centers, the number of administrative villages in each district, and its postcode.

Kode Wilayah	Name of District	Area in km²	Pop'n Census 2010	Pop'n Census 2020	Pop'n Estimate mid 2023	Admin centre	No. of villages	Post code
12.17.06	Sianjur Mula Mula	140.24	9,138	10,003	10,386	Ginolat	12	22396
12.17.05	Harian	560.45	7,860	9,397	9,784	Harian Boho	13	22391
12.17.09	Sitiotio	50.76	7,124	8,172	8,451	Sabulan	8	22397
12.17.02	Onan Runggu	60.89	10,329	11,122	11,520	Onan Runggu	12	22398
12.17.03	Nainggolan	87.86	11,849	12,871	13,443	Nainggolan	15	22394
12.17.04	Palipi	129.55	16,087	18,209	19,076	Mogang	17	22393
12.17.07	Ronggur Nihuta	94.87	8,356	9,692	10,055	Ronggur Nihuta	8	22392
12.17.08	Pangururan	121.45	29,412	34,209	36,218	Pasar Pangururan	28	22390
12.17.01	Simanindo	198.20	19,498	22,766	24,138	Ambarita	21	22395
	Totals	1,444.25	119,653	136,441	143,071	Pangururan	134

Notes: includes the small island of Tulas in Lake Toba. including the 2 kelurahan of Parhusip III and Siruma Hombar. including the 3 kelurahan of Pasar Pangururan, Pintu Sona and Siogung Ogung. includes the small islands of Pulau Tolping, Pulau Malau Satu, and Pulau Malau Dua in Lake Toba. including the kelurahan of Tuktuk Siadong.
Six of the nine districts within the regency are on the island of Samosir, while the others lie on the 'mainland' of Sumatra.

Samosir Island districts
* Onan Runggu
* Palipi
* Pangururan
* Ronggur Nihuta
* Simanindo
* Nainggolan
Mainland districts
* Sitiotio
* Harian
* Sianjur Mula Mula

However, a small part of Pangururan District lies on the 'mainland', cut off from the rest of the district by the canal.

Botanical Garden

2011: Samosir Regency with supervision from LIPI will build a 100-hectare Botanical Garden. It will finish 10 years later with a cost predicted about Rp.73 billion.

Geo park

A geopark worth Rp20 billion is expected to be created - beginning in mid-2012 - in cooperation with the Agency for the Assessment and Application of Technology. It has been proposed for incorporation into the world geopark network.