Utah isn't the highest.

http://www.slate.com/articles/life/map_of_the_week/2012/05/marriage_rates_nevada_and_hawaii_have_the_highest_marriage_rates_in_the_u_s_.html

Too bad they don't correlate this with other specifics such as age.

That makes sense. People actually travel to Nevada and Hawaii to get married, and that would throw off the results.

The important rates are a comparison of people in the age group most likely to become married - twenties - and the rate of marriages; and the rate of divorces an average of 5 to ten years later. Overall, only about half of those reaching marriage age in this country are getting married and four out of five marriages are ending in divorce,

Vermont is the highest rate in New England for marriages due to its early adoption of gay marriage, resulting in gay couples going to Vermont where a marriage industry has developed - much like Nevada as a quickie marriage state for Californians.