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Thiruvanathapuram
Kollam
Pathanamthitta
Alapuzha
Kottayam
Idukki
| Districts | Distict Headquarters | Subdivisions (Taluks) | Area |
| Alappuzha District | Alappuzha | Ambalapuzha, Chengannur, Cherthala, Karthikappally, Kuttanad, Mavelikkara | 1,414 km2 |
| Ernakulam District | Kakkanad | Aluva, Kanayannur, Kochi, Kothamangalam, Kunnathunad, Muvattupuzha, Paravur | 2,951 km2 |
| Idukki District | Painavu | Devikulam, Peerumade, Thodupuzha, Udumbanchola | 4,479 km2 |
| Kannur District | Kannur | Kannur, Thalassery, Thalipparamba | 2,966 km2 |
| Kasaragod District | Kasaragod | Kasaragod, Hosdurg | 1,992 km2 |
| Kollam District | Kollam | Karunagappally, Kollam, Kottarakkara, Kunnathur, Pathanapuram | 2,498 km2 |
| Kottayam District | Kottayam | Changanasserry, Kanjirappally, Kottayam, Meenachil, Vaikom | 2,203 km2 |
| Kozhikode District | Kozhikode | Koyilandy, Kozhikode, Vadakara | 2,345 km2 |
| Malappuram District | Malappuram | Eranad, Nilambur, Perinthalmanna, Ponnani, Tirur, Tirurangadi | 3,550 km2 |
| Palakkad District | Palakkad | Alathur, Chittur, Mannarkkad, Ottappalam, Palakkad | 4,480 km2 |
| Pathanamthitta District | Pathanamthitta | Adoor, Kozhencherry, Mallappally, Ranni, Thiruvalla | 2,462 km2 |
| Thiruvananthapuram District | Thiruvananthapuram | Chirayinkeezhu, Nedumangad, Neyyattinkara, Thiruvananthapuram | 2,192 km2 |
| Thrissur District | Thrissur | Chavakkad, Kodungallur, Mukundapuram, Thalapilly, Thrissur | 3,032 km2 |
| Wayanad District | Kalpetta | Mananthavady, Sultan Battery, Vythiri | 2,131 km2 |
Trissur
Palakkadu
Malappuram
Kozhikode
Wayanadu
Kannur
