Overall, looks like 67% are married. That's considerably higher than the national average, which is about 50%.
Marriage rates are dropping overall, as I'm sure you've heard.
Article from 2012.
Why is the US marriage rate falling sharply?
For the first time in memory,
unmarried Americans will soon outnumber those who are married, according to the latest research. So is this a watershed moment?
At first glance it would appear that, in common with many Western countries, marriage is in terminal decline in the United States.
In 1960, 72% of all American adults were married; in 2010 just 51% were, according to the Pew Research Center. The number dropped sharply by 5% in the most recent year, 2009-10.
"I think we are on the cusp of seeing marriage becoming less central to our life course and in framing the lives of our nation's children. So I think it is a major moment in that regard," says Bradford Wilcox, director of the National Marriage Project and a sociology professor at the University of Virginia.
https://www.bbc.com/news/magazine-16274740
Here's another article, saying that rates of marriage in the older population are rising. The reason is that men aren't dying as early as they used to.
Marriage Rates Rise for the Old, Decline for the Young
"The marriage rate among older Americans keeps increasing, even as more and more younger adults never marry or postpone it until later in life, according to a statistical analysis released this week by the Institute for Family Studies.
"As a result of these divergent trends, most 65-and-older people are married (55.3 percent) while most younger adults are not. In fact, the marriage rate among 18-to-64-year-olds dipped to a record low of 48.6 percent in 2016, using the latest available Census Bureau data."
https://www.aarp.org/home-family/friends-family/info-2018/marriage-rates-fd.html