According to the March of Dimes website, there has been an increase in the rate of preterm births in the U.S., rising from 2% to 9.8% in 2016. Furthermore, their data show significant differences in preterm birth rates, based on race and zip code. Below is a map of this data for the U.S. The colors are based on a “grade” that the March of Dimes has given each state based on the rate of preterm birth rates in that state. Visit the March of Dimes website here to find out more information on each state’s preterm birth rate report card.