Worldwide divorce rates by country and urban vs. rural

Divorces and crude divorce rates by urban/rural residence: 2004 - 2008

From the U.N. Demographic Yearbook

Very thorough note explaining how the statistics work, how they are collected, what exactly they measure, etc. 

This was the source for a recent Huffington Post pictorial on the 10 highest-divorce countries, which displayed little understanding but wonderful visuals.