There are more single people today than ever in history- 101 million in the U.S., 46% of the adult population (37.5 million/28% in 1970)
	Over 25% of households are single occupant households (17% in 1970)
	53% of households are married couples (70% in 1970)
	The marriage rate is decreasing, and is at its lowest in 30 years
	The divorce rate has remained stable since 1988
	While the exact divorce rate is a matter of debate, experts agree that somewhere between 40 and 60% of all marriages will end in divorce, and that for every marriage there is about one divorce
	Co-habitation is increasing, with a higher failure rate than marriage
	Single, separated, divorced or widowed people have higher rates of mental health disorders, depression, and suicide
	The percentage of young adults who say that having a good marriage is extremely important to them is increasing (94% in one study)
	The majority of first-born children are now conceived by, or born to, unmarried parents
	Half of all children will spend some time in a single parent family
	43% of first marriages end within 15 years
	39% of remarriages end within 10 years
	More than 85% of all adults marry at least once

A summary of a 1999 study by David Popenoe and Barbara Dafoe Whitehead of the National Marriage Project of Rutgers University on “The State Of Our Unions: The Social Health Of Marriage in America” states:

“Key social indicators suggest a substantial weakening of the institution of marriage. Americans have become less likely to marry. When they do marry their marriages are less happy. And married couples face a high likelihood of divorce. Over the past four decades, marriage has declined as the first living together experience for couples and as a status of parenthood. Unmarried cohabitation and unwed births have grown enormously, and so has the percentage of children who grow up in fragile families.”

Sources:
U.S. Census Bureau http://www.census.gov/
SmartMarriages www.smartmarriages.com
National Marriage Project http://marriage.rutgers.edu/state.html
American Association For Single People http://www.unmarriedamerica.com/