(CNN) -- There are 96 million people in the United States who have no spouse. That means 43 percent of all Americans over the age of 18 are single, according to the U.S. Census Bureau.

"Single" is defined as adults who have never been married, are divorced or are widowed in the bureau's America's Families and Living Arrangements survey of 2009.

Of the singletons, 61 percent of them have never said "I do." Twenty-four percent are divorced and 15 percent are widowed.

An increasing number of these single Americans -- more than 31 million -- are living alone, according to the census. They make up 27 percent of all households, up from 17 percent in 1970.

About 46 percent of all households nationwide are maintained by a single person. That adds up to 52 million singles.

And 11.6 million single parents -- mostly mothers -- were living with their children in 2009.

The census reported 9.9 million single mothers and 1.7 million single fathers lived with their kids.