Several scholars have studied migration within India, and one of the key observations is that the largest share of migration happens within districts, followed by within the state, then interstate, and finally international. These are empirically documented and vary from state to state, so the analysis must be disaggregated accordingly.
Historically, there have been well-established migration networks, like Gujarati entrepreneurs who migrated to countries like Nigeria, Ghana, and Uganda decades ago. Similarly, within India, new migration routes have been emerging rapidly. For example, the movement of Bengali Muslim men from West Bengal to Kerala is a relatively recent phenomenon, but it is growing quickly. There are several case studies on this group.
Despite linguistic and cultural differences, assimilation does occur over time. As with most migration, there are clear push and pull factors at play. But to understand these patterns, you need to assess each state individually, even though the overall analytical framework remains the same.
Take Bihar and eastern UP, for example. These regions traditionally sent agrarian workers to Punjab and Haryana, especially during peak agricultural seasons. That is changed now. With the rise of industry, many are heading instead to Maharashtra, Tamil Nadu, and Gujarat, toward factory jobs in industrial belts.
India’s growth trajectory, whether agriculture- or industry-led, determines the flow of migration. As we mechanise and industrialise, labour patterns shift accordingly. Construction work, for instance, has become a pan-India employment sector. You will find Assamese, Bengali, and Bihari workers engaged in construction across the country.
What we really need now is comprehensive data. Earlier, we relied on Census data to track internal migration. But it is time we had a dedicated national survey focused on migration. Ideally, every decade should include one major, detailed study of internal migration trends to inform policy and planning.