50 Million Children Lived with Married Parents in 2007
" In an expanded look at the structure of the American family, the U.S. Census Bureau reports that in 2007, 50 million children in the United States lived with married parents and 2.2 million children lived with two unmarried parents.

According to Families and Living Arrangements: 2007, some 73.7 million children younger than 18 lived in the United States. Of these, 67.8 percent lived with married parents, 2.9 percent lived with two unmarried parents, 25.8 percent lived with one parent and 3.5 percent lived with no parent present.

These data come from the 2007 Current Population Survey. This survey, which has been continuously conducted since 1940, has been expanded to include two new questions that allow tabulation about unmarried partner couples and their children."