"Divorce Rate in the US, 2008", a short "Family Profile" sheet from Bowling Green University's National Center for Family & Marriage Research, reports on a more rarely calculated but much more informative version of the divorce rate -- divorces per existing marriages, instead of the standard measure, the raw per capita divorce rate. It reports:
The US rate of divorces per married couple: 1.94 % in 2008. This means one out of every 52 couples divorced that year. The lowest was North Dakota with 1.43%. The highest was DC at 3.45% (although it has recently had the LOWEST raw per capita divorce rate.) Most states, though, generally seem at first glance to be higher on this scale if they have higher raw per capita divorce rates, and vice versa. The US per capita rate, in contrast, was 0.72% of the population divorcing every year, or 0.36 divorces for every 100 people. (It's now down to 0.68%, or 0.34 divorces, etc.)
US ratio of marriages celebrated to divorce granted: 1.83 in 2008. This number ranged from 3.1 in North Dakota to 1.3 in Delaware.