The number one moving destination in the country this summer turned out to be Chicago.

From May to August, which is generally the busiest part of the moving season, Chicago saw almost 47% more families moving in than it did moving out, though the city is still number six on the list for most outbound moves. Still, considerably more people were moving to the city than moving out, and it was still the most popular moving destination in the country.

Other Midwestern cities have seen similar population booms, like St. Louis and Minneapolis. Many of the new arrivals were millennials.

The survey showed that over 70% of families moving to top destination cities like Chicago, Washington, Atlanta, Boston, Los Angeles, Dallas, Phoenix and New York were doing so because of a corporate transfer or a new job.

Since Mayor Emanuel took office, 99 companies have opened offices in Chicago and 27 companies have opened corporate headquarters there. Site Selection magazine named Chicago the top corporate relocation metro in North America earlier this year, and the city gained over 5,800 residents in 2013, making it the third consecutive year of population growth for the Windy City after over 10 years of decline.

“United’s survey shows that our efforts to build the Chicago of tomorrow by investing in a diverse and highly educated workforce and recruitment of new businesses are having an impact,” Mayor Emanuel said in the announcement.

“Chicago’s population is growing, our tech and healthcare sectors are thriving, and we continue to build out our legacy of financial and professional service industries, all the while focusing resources on neighborhoods across the City to ensure that all Chicago residents have access to the benefits that this economic growth provides.”