but there are many smaller ethnic groups including Tuluvas, Tamils, Kannadigas and Konkanis. In addition, as of early 2013 there are close to 2.5 million (7.5% of state population) migrant workers from other states of India in Kerala. Language Kerala is the most unilingual state of India in which about 97% of the total population speak Malayalam as their Native language. However, this may be conflated due to the way languages are organised in the census system in India. In addition, there is a significant Tamil population in Idukki district, which accounts for 17.48% of its total population. Tulu and Kannada are spoken in the northern portions of Kasaragod district, each of which account for 8.77% and 4.23% of total population in the district respectively. Religion Hindus constitute 54.7% of the population of Kerala, followed by Islam with 26.6% population and Christianity at third with 18.4% population as per 2011 census. Religious demographics of Travancore (1816–1941) Sources: Religious Demographics of Malabar District (1871–1951) Sources: Communities Castes of Kerala The Scheduled Caste (SC) population of Kerala State is 3,123,941 which is 9.8% of overall population. Scheduled Tribes in Kerala, with a population of 364,000, constitute 1.14% of the population. Denominations groups among Christians: Catholic church (Syrian and Latin rites) is the largest denomination among Kerala Christians. Malankara orthodox church, Jacobite Syrian orthodox church and Marthomite Syrian church denominations claim Syrian roots. Major Protestant groups include Church of South India (CSI), various Pentecostal churches. Chaldean Syrian, Seventh Day Adventists, Salvation Army are some other denominations. Tribal communities Kerala has approximately 35 distinct scheduled tribes that constitute 1.3% of the population. Though entirely unique, their languages are often not highlighted as distinct in the census. The Paniyan, who are the numerically dominant tribe, live in north east of the state and practice settled cultivation. The Kattunaikan, Kurichian and Kuruman belong to the same region. Palleyan, Palliyan and Palliyar inhabit the Idukki region not far from the Anamalai and Palani hills of Tamil Nadu where you find the same population. The Kadar, Irular, Kurumbas, Maha malasar and Malasar inhabit the Palghat region close to their counterparts in Niligiri and Anamalai hills of Tamil Nadu. The same is the case of the Kudiya and Koraga living in the northern most tip of the state next to Kodagu and Dakshina Kannada region of Karnataka. Age structure (2011 census) 0–6 years: 9.95% 7–14 years: 23.9% 15–59 years: