Methodology
It is a review-based paper prepared by studying the existing relevant research papers on the international migrations of India and other various countries; internal migration of India since the first Census of India 1872; and others articles and research papers on the importance of Census which are essential materials for the study. These papers are collected from different national and international journals in the Google Scholar. The study primarily focussed on the Indian context though many international papers are being studied on migration and Census of other countries.