Illinois’ map can be found below. Researchers noted that there are some caveats to the data. In states or counties with a smaller population or sample size, the estimates are derived less from ...

According to 2015 census estimates, half of the US population lives in these 143 counties (ranked by population): Los Angeles County, California Cook County, Illinois Harris County, Texas Maricopa ...

While it may be a long shot, several Illinois counties may join Indiana if a special commission rules in favor of addition.