New York is top in the U.S. in terms of its residents leaving for other states. In 2015, New York had a population of 19.5 million. By 2016 (the latest year available), it shrank to about 19.3 million, resulting in a net drop of 186,000 people. This trend has been the case for awhile, as census data shows more New York citizens have been moving out of the state since around 2011.