Due to the Large scale of Migration to the District from other parts of Kerala and from the Neighboring Tamilnadu, Idukki is having a mixed culture

Tribes

Thevan Raja Mannan, the one and only one King of Tribal Kingdom in the entire Kerala is living at Kovilmala of Kanchiyar Panchayat in Udumbanchola Taluk of Idukki District. His Predesessor Nayan Raja Mannan was his uncle. His Kingdom is having four divisions, namely, 'Thekkottu Kattu Rajyam', 'Nadukkuda Kattu Rajyam', 'Athal Orupuram' and 'Chenkanattu Mala'. Their Goddess (Kula Deivam) is 'Madura Meenakshi Amma' of famous Madura Temple and they are also worshiping few other Gods.

Idukki is the second largest place in Kerala where the most number of scheduled tribes and tribal ambiguities exist. There are 245 tribal settlements in the District of which 74 are in Thodupuzha; 11 in Peermedu; 126 in Devikulam and 34 in Udumbanchola Taluks. Almost all the scheduled tribes are living in the extreme remote hilly banks and in the deep interiors of thickly growing forests of this district. According to the latest Census around 11516 Scheduled tribal families are living in the district.