East Kotawaringin Regency () is one of the thirteen regencies which comprise the Central Kalimantan Province on the island of Kalimantan (Borneo), Indonesia. It originally covered a much larger part of the province, having been split from a single Kotawaringin Regency on 26 June 1959 into separate regencies for East and West Kotawaringin, but on 10 April 2002 several districts in the west of the regency were split off to form the new Seruyan Regency, and several districts in the east of the regency were similarly split off to form the new Katingan Regency. The land area of the residual East Kotawaringin Regency is 15,543.82 km2, and its population was 374,175 at the 2010 Census,Biro Pusat Statistik, Jakarta, 2011. and 428,900 at the 2020 Census;Badan Pusat Statistik, Jakarta, 2021. the official estimate as at mid 2025 was 452,870 (comprising 233,500 males and 219,370 females).Badan Pusat Statistik, Jakarta, 27 February 2026, Kabupaten Kotawaringin Timur Dalam Angka 2026 (Katalog-BPS 1102001.6202) The town of Sampit is the capital of East Kotawaringin Regency.
Geography The residual regency is essentially the catchment area of the Mentaya (Sampit) River. The large town of Sampit (the administrative centre of the regency) lies on the west bank of the river; its metropolitan area encompasses most of Mentawa Baru Ketapang District (excluding 5 rural desa in the south) and all of Baamang District.
Administrative districts At the 2010 Census, East Kotawaringin Regency consisted of fifteen districts (kecamatan), but two more districts (Tualan Hulu and Telaga Antang) were subsequently established by the splitting of existing districts. The seventeen districts are tabulated below with their areasBadan Pusat Statistik, Jakarta, 28 February 2025, Kabupaten Kotawaringin Timur Dalam Angka 2025 (Katalog-BPS 1102001.6202) and population totals from the 2010 CensusBiro Pusat Statistik, Jakarta, 2011. and the 2020 Census,Badan Pusat Statistik, Jakarta, 2021. together with the official estimates as at mid 2025.Badan Pusat Statistik, Jakarta, 27 February 2026, Kabupaten Kotawaringin Timur Dalam Angka 2026 (Katalog-BPS 1102001.6202) The table also includes the locations of the district administrative centres, the number of administrative villages in each district (totaling 168 rural desa and 17 urban kelurahan), and its postal codes.
Kode Wilayah Name ofDistrict(kecamatan) Area inkm2 Pop'nCensus2010 Pop'nCensus2020 Pop'nEstimatemid 2025Admincentre No.ofvillages Postcodes 62.02.08 Mentaya Hilir Selatan (South Lower Mentaya) 209.24 20,801 23,010 23,240Samuda 10 (a) 74363 62.02.11 Teluk Sampit (Sampit Bay) 663.27 8,935 10,562 11,020Ujung Pandaran 674364 62.02.09 Pulau Hanaut (Hanaut Island) 625.50 15,473 16,809 16,830Bapinang 1474362 62.02.06 Mentawa Baru Ketapang 349.45 76,951 98,680 107,050Sampit 11 (b) 74321 - 74326 62.02.12 Seranau 708.60 9,587 10,874 11,120Mentaya Seberang 6 (c) 74314 - 74315 (d) 62.02.05 Baamang 206.84 51,538 69,714 77,600Baamang 6 (e) 74311 - 74316 62.02.07 Mentaya Hilir Utara (North Lower Mentaya) 973.50 15,840 18,780 19,610Bagendang 774361 Sub-totals Southern group 3,736.40 199,125 248,429 266,470 60 62.02.01 Kota Besi 638.60 14,980 18,444 19,620Kota Besi 11 (f) 74353 62.02.14 Telawang 1,171.53 16,823 20,518 21,720Sebabi 674350 62.02.02 Cempaga 864.02 19,076 22,297 23,130Cempaga Mulia 874354 62.02.13 Cempaga Hulu (Upper Cempaga) 1,501.97 23,262 21,586 22,040Pundu 1174359 62.02.04 Parenggean 718.15 35,608 26,628 26,920Parenggean 15 (c) 74355 62.02.16 Tualan Hulu (Upper Tualan) 846.05 (g) 7,766 7,930Luwuk Sampun 1174358 62.02.03 Mentaya Hulu (Upper Mentaya) 1,315.68 28,522 20,533 20,960Kuala Kuayan 16 (c) 74357 62.02.15 Bukit Santuai 1,684.34 8,038 10,380 11,300Tumbang Penyahuan 1474356 62.02.10 Antang Kalang 1,605.18 28,741 13,357 13,640Tumbang Kalang 1574352 62.02.17 Telaga Antang (Lake Antang) 1,461.90 (h) 18,957 19,160Tumbang Mangkup 1874352 (i) Sub-totals Northern group 11,807.42 175,050 180,466 186,420 125 Totals 15,543,82 374,175 428,895 452,870Sampit 185
Notes: (a) comprises 2 kelurahan (Samuda Kota and Basirih Hilir) and 8 desa. (b) comprises 5 kelurahan (Ketapang, Mentawa Baru Hilir, Mentawa Baru Hulu, Pasir Putih and Sawahan) and 6 desa. (c) including one kelurahan (the district admin centre). (d) except for the village of Mentaya Seberang, which has a post code of 74324. (e) comprises 5 kelurahan (Baamang Barat, Baamang Hilir, Baamang Hulu, Baamang Tengah and Tanah Mas) and 1 desa (Tinduk), which are all part of Greater Sampit. (f) comprises 2 kelurahan (Kota Besi Hilir and Kota Besi Hulu) and 9 desa. (g) the 2010 population of Tualan Hulu District is included in the figures for the districts from which it was cut out. (h) the 2010 population of Telaga Antang District is included in the figure for Antang Kalang District. (i) except for the village of Buana Mustika, which has a post code of 74356.
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