No. | Subdivisions | Capital | Area (km2) | Population (2015)[2] | 1 | Attapeu | Attapeu (Samakkhixay District) | 10,320 | 139,628 | 2 | Bokeo | Houayxay (Houayxay District) | 6,196 | 179,243 | 3 | Bolikhamsai | Pakxan (Pakxan District) | 14,863 | 273,691 | 4 | Champasak | Pakse (Pakse District) | 15,415 | 694,023 | 5 | Houaphanh | Xam Neua (Xam Neua District) | 16,500 | 289,393 | 6 | Khammouane | Thakhek (Thakhek District) | 16,315 | 392,052 | 7 | Luang Namtha | Luang Namtha (Namtha District) | 9,325 | 175,753 | 8 | Luang Prabang | Luang Prabang (Luang Prabang District) | 16,875 | 431,889 | 9 | Oudomxay | Muang Xay (Xay District) | 15,370 | 307,622 | 10 | Phongsaly | Phongsali (Phongsaly District) | 16,270 | 177,989 | 11 | Sainyabuli | Sainyabuli (Xayabury District) | 16,389 | 381,376 | 12 | Salavan | Salavan (Salavan District) | 10,691 | 396,942 | 13 | Savannakhet | Kaysone Phomvihane (Khanthaboury District) | 21,774 | 969,697 | 14 | Sekong | Sekong (La Mam District) | 7,665 | 83,600 | 15 | Vientiane Prefecture | Vientiane (Chanthabouly District) | 3,920 | 820,940 | 16 | Vientiane Province | Phonhong (Phonhong District) | 15,927 | 419,090 | 17 | Xiengkhouang | Phonsavan (Pek District) | 15,880 | 244,684 | 18 | Xaisomboun Province | Anouvong (Anouvong District) | 8,300 | 85,168 | | |