U.S. Census Bureau: In the Past 43 Years, The Percentage of Households Made up of Married Couples With Children Declined from 40% to 19%

The U.S. Census Bureau report is linked below.

U.S. Census Bureau: Households With Married Couples Who Have Children Have Declined in Frequency

"Between 1970 and 2013, the share of households that were married couples with children decreased by about half from 40 to 19 percent…"

---U.S. Census Bureau, November 25, 2013 Report