How did your municipality do?
In the two years following the 2010 census, 101 municipalities in the core counties of the St. Louis area lost population, 86 municipalities gained residents, and 14 went unchanged from 2010 through 2012.
The municipalities with the largest absolute gains in population were O’Fallon, Mo., 2,650; Wentzville, 2,146; St. Peters, 1,503; O’Fallon, Ill., 912; the city of St. Charles, 669; and Dardenne Prairie, 523.
The municipalities with the largest percentage gain in population were Cottleville, 15 percent; Wentzville, 7 percent; Herculaneum, 6 percent, Mascoutah, 5 percent and Dardenne Prairie, 4.5 percent.
On a county level, the changes were split. Four counties increased population, with St.