David Leonhardt has an interactive map up showing the percentages by state of two-parent families:
When it comes to family arrangements, the United States has a North-South divide. Children growing up across much of the northern part of the country are much more likely to grow up with two parents than children across the South.
It’s not just a red-blue political divide, either. There is a kind of two-parent arc that starts in the West in Utah, runs up through the Dakotas and Minnesota and then down into New England and New Jersey. It encompasses both the conservative Mountain West and the liberal Northeast.
Single-parent families, by contrast, are most common in a Southern arc beginning in Nevada, and extending through New Mexico, Oklahoma and the Deep South before coming up through Appalachia into West Virginia.
The whole article is interesting as it has implications for where our culture is and where it is heading.