Statement showing 1961 territorial units constituting the present set-up of kerala, Houseless and Institutional population, Decadal variation in population since, Towns and urban agglomerations classified by population in 1971 with variation since 1901, Classification of workers and non-workers according to main activity by educational levels in urban areas only. Industrial classification of persons at work other than at cultivation as main activity by sex and divisions-Major groups and minor groups, Occupational classification of persons at work according to main activity other than cutlivation classified by sex and age groups in urban areas only.