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Here are the list of districts and its formation date
| District | Formed in |
|---|---|
| Thiruvananthapuram | 1949 July 1 |
| Kollam | 1949 July 1 |
| Kottayam | 1949 July 1 |
| Thrissur | 1949 July 1 |
| Palakkad | 1957 January 1 |
| Kozhikkode | 1957 January 1 |
| Kannur | 1957 January 1 |
| Alappuzha | 1957 August 17 |
| Ernakulam | 1958 April 1 |
| Malappuram | 1969 June 16 |
| Idukki | 1972 January 26 |
| Wayanad | 1980 November 1 |
| Pathanamthitta | 1982 November 1 |
| Kasargode | 1984 May 24 |
