You've probably heard that 50% of marriages end in divorce. That number is a bit misleading. For one it doesn't mean that any particular marriage has a 50/50 chance. Many of those marriages ending in divorce are the 2nd, 3rd, 4th or later marriage for the individuals. There are also a lot of other factors that go into the potential statistical survival rate of a marriage like demographics. Marriage rates and divorce rates also vary from state to state.
I got the marriage and divorce numbers from Marriage and Divorce numbers from the CDC. and State populations from the Census The numbers are for the year 2009.
Note : I wouldn't read much into these numbers. Higher divorce rate in a given state doesn't reflect on that state. The differences could be due to demographics like different average ages or similar.
Here is the table giving the number of marriages and divorces per 1000 residents :
|District of Columbia||3.2||2.2|