Metro population: 3,733,580 Approximate number of millennial residents: 937,129 Increase in millennial population from 2010 to 2015: 10.8%Metro population: 768,013 Approximate number of millennial residents: 122,114 Increase in millennial population from 2010 to 2015: 11.1%Metro population: 6,656,947 Approximate number of millennial residents: 1,650,923 Increase in millennial population from 2010 to 2015: 11.7%Metro population: 701,982 Approximate number of millennial residents: 126,357 Increase in millennial population from 2010 to 2015: 11.7%Metro population: 2,000,860 Approximate number of millennial residents: 544,234 Increase in millennial population from 2010 to 2015: 11.8%Metro population: 998,714 Approximate number of millennial residents: 262,662 Increase in millennial population from 2010 to 2015: 12.2%Metro population: 2,387,138 Approximate number of millennial residents: 596,785 Increase in millennial population from 2010 to 2015: 12.7%Metro population: 2,812,732 Approximate number of millennial residents: 694,745 Increase in millennial population from 2010 to 2015: 12.8%Metro population: 2,384,075 Approximate number of millennial residents: 598,403 Increase in millennial population from 2010 to 2015: 14.4%Metro population: 712,327 Approximate number of millennial residents: 188,054 Increase in millennial population from 2010 to 2015: 14.7%