Updates: 
Tonga's secondary subdivisions are 23 districts.
| District | HASC | Pop-2011 | Pop-2006 | Pop-1996 | Pop-1986 | Capital |
|---|
| 'Eua Fo'ou | TO.EU.EF | 2,164 | 2,257 | 2,168 | 1,993 | Fata'ulua |
| 'Eua Motu'a | TO.EU.EM | 2,852 | 2,949 | 2,766 | 2,400 | 'Ohonua |
| Foa | TO.HA.FO | 1,359 | 1,479 | 1,434 | 1,410 | Faleloa |
| Ha'ano | TO.HA.HN | 511 | 619 | 773 | 891 | Ha'ano |
| Hahake | TO.VA.HK | 2,297 | 2,422 | 2,291 | 2,299 | Ta'anea |
| Hihifo | TO.VA.HI | 2,105 | 2,267 | 2,375 | 2,093 | Longomapu |
| Kolofo'ou | TO.TT.KF | 18,957 | 18,463 | 16,953 | 15,903 | Kolofo'ou |
| Kolomotu'a | TO.TT.KM | 17,088 | 15,848 | 14,451 | 13,115 | Kolomotu'a |
| Kolovai | TO.TT.KV | 4,076 | 4,096 | 4,037 | 4,031 | Kolovai |
| Lapaha | TO.TT.LA | 7,380 | 7,255 | 7,370 | 7,005 | Lapaha |
| Leimatu'a | TO.VA.LE | 2,436 | 2,742 | 2,753 | 2,884 | Leimatu'a |
| Lulunga | TO.HA.LU | 1,055 | 1,075 | 1,282 | 1,584 | Ha'afeva |
| Motu | TO.VA.MO | 985 | 875 | 1,348 | 1,384 | Falevai |
| Mu'omu'a | TO.HA.MU | 609 | 630 | 735 | 885 | Nomuka |
| Neiafu | TO.VA.NE | 5,774 | 5,787 | 5,650 | 5,268 | Neiafu |
| Niua Fo'ou | TO.NI.NF | 523 | 646 | 735 | 763 | Angaha |
| Niua Toputapu | TO.NI.NT | 759 | 1,019 | 1,283 | 1,605 | Hihifo |
| Nukunuku | TO.TT.NU | 7,733 | 6,820 | 6,160 | 5,863 | Nukunuku |
| Pangai | TO.HA.PA | 2,410 | 2,967 | 2,966 | 2,850 | Pangai |
| Pangaimotu | TO.VA.PM | 1,325 | 1,412 | 1,298 | 1,247 | Pangaimotu |
| Tatakamotonga | TO.TT.TA | 7,233 | 6,969 | 6,828 | 6,773 | Tatakamotonga |
| 'Uiha | TO.HA.UI | 672 | 800 | 948 | 1,299 | 'Uiha |
| Vaini | TO.TT.VA | 12,949 | 12,594 | 11,180 | 11,104 | Vaini |
|
Other names of subdivisions:
- Hahake: Eastern, Ha'alaufuli (variant)
- Hihifo: Western (variant)
- Kolovai: Hihifo, Western (variant)
- Motu: Island (variant)
- Pangai: Lifuka (variant)