Administration
Sumba is part of the East Nusa Tenggara province. The island and the very small islands administered along with it are split into four regencies (local government districts); these are: Sumba Barat (West Sumba), Sumba Barat Daya (Southwest Sumba), Sumba Tengah (Central Sumba) and Sumba Timur (East Sumba). The island accounts for some 14.6% of the provincial population in 2010. The provincial capital is not located on the island, but in West Timor.
| Name | Capital | Est. | Statute | Area (km²) | Population 2010 Census |
|---|---|---|---|---|---|
| West Sumba Regency (Sumba Barat) |
Waikabubak | 1958 | UU 69/1958 | 737 | 111,023 |
| East Sumba Regency (Sumba Timur) |
Waingapu | 1958 | UU 69/1958 | 7,000 | 227,835 |
| Central Sumba Regency (Sumba Tengah) |
Waibakul | 2007 | UU 3/2007 | 1,869 | 62,510 |
| Southwest Sumba Regency (Sumba Barat Daya) |
Tambolaka | 2007 | UU 16/2007 | 1,445 | 283,818 |
| Sumba | * | 11,052 | 685,186 |
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