Preterm births by county in Illinois

Change Indicator


Data Provided By
Note: Non-consecutive years appear adjacent in the trend line
because one or more years have been deselected.

Definitions: "Preterm" refers to babies born with a gestational period of less than 37 completed weeks.

Data represent two-year proportions.

"*" indicates that standards of reliability were not met.  In this case, IDPH suppresses estimates for which the numerator is less than 10.

Data Source: For data from 2009 onward: Illinois Department of Public Health, Birth Characteristics by Resident County, available at: