Pew has a report summarizing data on marriage and divorce from the Census’s American Community Project: The States of Marriage and Divorce. It includes state-level information on things such as median age of first marriage, share of the population currently divorced, percentage of the population that has been married three times or more, etc. It also includes national summary statistics, such as:
On the national level, the Census Bureau survey showed that a shrinking share of Americans are married — 52% of males ages 15 and older and 48% of females ages 15 and older. The proportion of Americans who are currently married has been diminishing for decades and is lower than it has been in at least half a century….Nationally, the median age at first marriage has been climbing for decades: It now stands at 28 for men and 26 for women.
Pew also provides an interactive map the reports data for each state and for both men and women.