QuickStats: Percentage of Infants Born Late Preterm by Mother’s State of Residence

In 2012, 8.1% of births in the United States were late preterm births. The percentage of births that were late preterm varied by state and ranged from 6.2% in Vermont to 12.0% in Mississippi.

http://www.cdc.gov/mmwr/preview/mmwrhtml/mm6320a6.htm?s_cid=mm6320a6_e