More than 56 million Indians lived in states other than the ones they were born in, newly released census data for 2011 shows. While UP, Bihar , Rajasthan and MP had the highest ‘out-migration’, Maharashtra, Delhi and Gujarat saw the largest ‘in-migration’.Among larger states, Bihar had the lowest number of people migrating into the state with most of the one million plus migrants coming from Jharkhand and UP. In the case of UP, which had just over four million in-migrants compared to almost 13 million out-migrants, a lot of the in-migration could also be due to people from all of India flocking to the NCR cities of Noida and Ghaziabad. In Haryana too, Gurgaon and Faridabad could account for a sizeable chunk of the 3.7 million in-migrants.While the general thumb rule is that states with a high level of development have lesser out-migration and more people migrating into them, census data shows that states like Tamil Nadu and Andhra Pradesh actually had higher out-migration than Bengal or Assam, clearly less developed than the southern states. And Uttarakhand , Chhattisgarh and Jharkhand actually had more in-migration than out-migration.People born in UP constituted the largest chunk (45%) of Delhi’s migrant population followed by Madhya Pradesh (41%), Maharashtra (31%), and Gujarat (24%). Contrary to the popular perception of Biharis moving in droves to Punjab, Haryana, Delhi or Mumbai, migrants from Bihar moved more towards the east. People born in Bihar thus constituted 62% of migrants in Jharkhand, 47% in West Bengal, 31% in Assam and other north-eastern states compared to just 18% in Delhi and 6% in Maharashtra.In most southern states, people from neighbouring states constituted the bulk of the migrant population. In Kerala, Bengalis, who constituted 5% of the migrant population were the only significant non-southern chunk, with Tamils (53.2%) and Kannadigas (16.4%) being the most numerous among non-locals. Similarly, in Punjab, Himachal, Uttarakhand and Haryana, people from neighbouring states account for most of the migrant population, though natives of UP and Bihar, too, have a sizeable presence in these states.Rajasthanis mostly moved to Gujarat, Madhya Pradesh and Haryana. They, however, constitute the biggest chunk of those from the North (5%), among migrants in Tamil Nadu and other southern states like Andhra and Karnataka.