"The State Data Center of Iowa is your source for population, housing, business and government statistics about Iowa, including data from the U.S. Census Bureau, Iowa state agencies, and other state and federal sources."
"The Minnesota State Demographic Center (SDC), part of the Minnesota Department of Administration, is the main provider of demographic data and analysis for the state of Minnesota."
Illinois Open Data Portal lets you find data across state, find facts about your state, lets you create maps and graphs, and lets you freely download the data for your own analysis. Many of these datasets are updated daily, and some even more often.
Demographic Services Center (DSC) staff develop annual estimates and future projections of the population for all Wisconsin towns, villages, and cities.