Serdang Bedagai Regency is a regency on the east coast of North Sumatra Province of Indonesia, facing Malaysia, with 95 km of coastline and covering an area of 1,900.22 square kilometres, divided into seventeen districts (kecamatan), in turn subdivided into 243 villages. Its administrative centre is the town of Sei Rampah. The regency surrounds the independent city of Tebing Tinggi, and also contains a district (kecamatan) by the same name (Tebing Tinggi District surrounds the city on its west side, while Tebing Syahbandar District surrounds the city on its east side). The name "Serdang Bedagai" was derived from the two Sultanates which formerly existed in the Region; they were Serdang Sultanate and Padang Bedagai Sultanate. The population was 592,922 at the 2010 Census,Biro Pusat Statistik, Jakarta, 2011. while the 2020 Census produced a total of 657,490;Badan Pusat Statistik, Jakarta, 2021. the official estimate as of mid 2025 was 700,077 (comprising 352,386 males and 347,691 females).Badan Pusat Statistik, Jakarta, 27 February 2026, Kabupaten Serdang Bedagai Dalam Angka 2026 (Katalog-BPS 1102001.1218)
Location Serdang Bedagai Regency extends between 3° 01’ 2.5’’ North latitude and 3° 46’ 33’’ North latitude, and between 98° 44’ 22” east longitude and 99° 19’ 01’’ east longitude. To the north are the Malacca Straits, to the west is Deli Serdang Regency (surrounding Medan), to the south and southeast is Simalungun Regency, and to the east are the Buaya River and Ular River bordering Batubara Regency, which was formed in 2006 from the western part of the Asahan Regency.
Administration The Serdang Bedagai Regency is divided administratively into seventeen districts (kecamatan), tabulated below with their areas and their populations at the 2010 Census and the 2020 Census, together with the official estimates as of mid 2025. The table also includes the locations of the district administrative centres, the numbers of administrative villages in each district (totaling 237 rural desa and 6 urban kelurahan), and its post code. Kode Wilayah Name ofDistrict(kecamatan) Area in km2 Pop'nCensus2010 Pop'nCensus2020 Pop'nEstimatemid 2025 Admin centre No.ofvillagesPostcode 12.18.10 Kotarih Badan Pusat Statistik, Jakarta, 26 September 2024, Kecamatan Kotarih Dalam Angka 2024 (Katalog-BPS 1102001.1218010) 78.027,9759,1699,942Kotarih1120982 12.18.11 Silinda Badan Pusat Statistik, Jakarta, 26 September 2024, Kecamatan Silinda Dalam Angka 2024 (Katalog-BPS 1102001.1218011) 56.748,3329,51410,281Silinda920983 12.18.17 Bintang Bayu Badan Pusat Statistik, Jakarta, 26 September 2024, Kecamatan Bintang Bayu Dalam Angka 2024 (Katalog-BPS 1102001.1218012) 95.5910,58112,51113,750Bitang Bayu1920984 12.18.09 Dolok Masihul Badan Pusat Statistik, Jakarta, 26 September 2024, Kecamatan Dolok Masihul Dalam Angka 2024 (Katalog-BPS 1102001.1218020) 237.4248,24152,70555,752Pekan Dolok Masihul28 (a) 20991 12.18.12 Serbajabi Badan Pusat Statistik, Jakarta, 26 September 2024, Kecamatan Serbajadi Dalam Angka 2024 (Katalog-BPS 1102001.1218021) 50.6919,56021,75923,219Serbajabi1020995 12.18.08 Sipispis Badan Pusat Statistik, Jakarta, 26 September 2024, Kecamatan Sipispis Dalam Angka 2024 (Katalog-BPS 1102001.1218030) 145.2631,61733,82635,521Sipispis2020992 12.18.07 Dolok Merawan Badan Pusat Statistik, Jakarta, 26 September 2024, Kecamatan Dolok Merawan Dalam Angka 2024 (Katalog-BPS 1102001.1218040) 120.6017,02917,97618,702Dolok Merawan172099312.18.13 Tebing TinggiBadan Pusat Statistik, Jakarta, 26 September 2024, Kecamatan Tebingtinggi Dalam Angka 2024 (Katalog-BPS 1102001.1218050) 182.2940,25341,16242,170Tebing Tinggi1420999 12.18.16 Tebing Syahbandar Badan Pusat Statistik, Jakarta, 26 September 2024, Kecamatan Tebing Syahbandar Dalam Angka 2024 (Katalog-BPS 1102001.1218051) 120.3032,19133,58534,743Paya Pasir1020998 12.18.06 Bandar Khalipah Badan Pusat Statistik, Jakarta, 26 September 2024, Kecamatan Bandar Khalipah Dalam Angka 2024 (Katalog-BPS 1102001.1218060) 116.0024,77425,85726,754Bandar Khakipah520994 12.18.05 Tanjung Beringin Badan Pusat Statistik, Jakarta, 26 September 2024, Kecamatan Tanjung Beringin Dalam Angka 2024 (Katalog-BPS 1102001.1218070) 74.1736,86442,14245,567Tanjung Beringin820996 12.18.04 Sei RampahBadan Pusat Statistik, Jakarta, 26 September 2024, Kecamatan Sei Rampah Dalam Angka 2024 (Katalog-BPS 1102001.1218080) 198.9063,37971,36676,603Sei Rampah1720995 12.18.15 Sei Bamban Badan Pusat Statistik, Jakarta, 26 September 2024, Kecamatan Sei Bamban Dalam Angka 2024 (Katalog-BPS 1102001.1218081) 72.2642,79146,04348,347Sei Bamban1020995 12.18.03 Teluk Mengkudu (Mengkudu Bay) Badan Pusat Statistik, Jakarta, 26 September 2024, Kecamatan Teluk Mengkudu Dalam Angka 2024 (Katalog-BPS 1102001.1218090) 66.9541,11848,33452,972Sialang Buah1220997 12.18.02 PerbaunganBadan Pusat Statistik, Jakarta, 26 September 2024, Kecamatan Perbaungan Dalam Angka 2024 (Katalog-BPS 1102001.1218100) 111.6299,936112,153120,189Simpang III Pekan28 (b) 20985 12.18.14 Pegajahan Badan Pusat Statistik, Jakarta, 26 September 2024, Kecamatan Pegajahan Dalam Angka 2024 (Katalog-BPS 1102001.1218101) 93.1226,85930,20632,403Pegajahan13 (c) 20986 12.18.01 Pantai Cermin Badan Pusat Statistik, Jakarta, 26 September 2024, Kecamatan Pantai Cermin Dalam Angka 2024 (Katalog-BPS 1102001.1218110) 80.3042,88349,18253,262Pantai Cermin1220987 Totals 1,900.22594,383657,490700,077 243
Notes: (a) including one kelurahan (Pekan Dolok Masihul). (b) comprising four kelurahan (Batang Terap, Melati I, Simpang Tiga Pekan and Tualang) and 24 desa. (c) including one kelurahan (Melati Kebun).
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