West Kutai Regency (Indonesian: Kabupaten Kutai Barat) is a regency (kabupaten) in the Indonesian province of East Kalimantan. It previously covered a much greater area, with a population of 165,091 at the 2010 Census, but on 11 January 2013 the five northernmost districts were split off to form a new Mahakam Ulu Regency; the residual area of West Kutai Regency is 20,384.6 km, and it had a population of 140,097 at the 2010 Census, and 165,938 at the 2020 Census; the official estimate as at mid 2023 was 177,007. The town of Sendawar is the administrative capital.

Following the removal of the northern five districts in December 2012 to form the new Mahakam Ulu Regency, the residual West Kutai Regency is divided into sixteen districts (kecamatan), tabulated below with their areas and their 2010 and 2020 Census populations, together with the official estimates as at mid 2023 The table also includes the locations of the district administrative centres, the number of administrative villages (totaling 190 rural kamponmg or desa, and 4 urban kelurahan) in each district, and its postal codes.

Kode Wilayah	Name of District (kecamatan)	Area in km	Pop'n Census 2010	Pop'n Census 2020	Pop'n Estimate mid 2023	Admin centre	No. of villages	Post codes
64.07.12	Bongan	2,305.3	8,997	10,499	11,614	Muara Kendang	16	75772
64.07.11	Jempang	744.5	11,279	11,211	11,932	Tanjung Isuy	12	75773
64.07.13	Penyinggahan	192.1	3,904	3,815	4,042	Penyinggahan Ilir	6	75763
64.07.10	Muara Pahu	1,110.6	8,272	8,344	8,811	Tanjung Laor	12	75774
64.07.17	Siluq Ngurai	1,629.1	4,292	5,880	6,455	Muhur	16	75771
64.07.09	Muara Lawa	436.7	6,483	7,033	7,708	Muara Lawa	8	75775
64.07.14	Bentian Besar	1,856.1	3,093	3,213	3,437	Dilang Puti	9	75778
64.07.08	Damai	2,027.5	8,476	10,549	11,198	Damai Kota	17	75777
64.07.16	Nyuatan	1,343.3	5,348	6,357	6,734	Dempar	10	75776 & 75777
64.07.07	Barong Tongkok	405.9	23,935	31,746	34,647	Barong Tongkok	21	75776
64.07.15	Linggang Bigung	2,299.1	13,712	15,843	16,395	Linggang Bigung	11	75576
64.07.06	Melak	179.2	10,596	15,041	15,840	Melak Ilir	6	75765
64.07.20	Sekolaq Darat	49.3	8,394	10,301	10,903	Sekolaq Darat	8	75764
64.07.18	Mook Manaar Bulatn	2,964.6	7,478	8,409	8,796	Gunung Rampah	16	75765
64.07.05	Long Iram	2,499.5	6,407	7,184	7,472	Long Iram Kota	11	75766
64.07.19	Tering	341.8	9,431	10,513	11,023	Tering Lama	15	75760
	Totals	20,384.6	140,097	165,918	177,007	Sendawar	194

Notes: (a) includes 2 kelurahan - Barong Tongkok and Simpang Raya. (b) includes 2 kelurahan - Melak Ilir and Melak Ulu.
(c) except the four villages of Abit, Muara Jawaq, Rembayan and Tondah (which share a postcode of 75774). (d) includes the riverine island of Pulau Kualan.

• Official website

0°35′39″S 115°30′57″E / 0.5942°S 115.5157°E / -0.5942; 115.5157