A Decade of Changes in State Fertility Rates for Women Age 30 and Older: United States, 2015-2024.

Introduction:This report describes changes in fertility rates for women ages 30-34, 35-39, and 40 and older by state for the decade 2015 through 2024. Methods:Data are from the National Vital Statistics System natality data file for 2015 and 2024, which is based on birth certificates registered in all 50 states and the District of Columbia (D.C.). Fertility rates (the number of births per 1,000 women in the specified age group) are calculated for women in the 5-year age groups 30-34 and 35-39 and 10-year age group 40-49. Changes in the rates are based on pairwise comparisons and tested using a two-tailed z test statistic. Key Findings:The U.S. fertility rate for women ages 30-34 decreased 8% from 2015 to 2024, while the rate for ages 35-39 increased 5% and that for women 40 and older increased 24%. By state from 2015 to 2024, rates for women ages 30-34 declined in 37 states, rates for women 35-39 increased in 35 states and declined in 5 states and D.C., and those for women 40 and older rose in 46 states.