The percentage of people who are married varies significantly by region. Here, I’ve broken the data down by county. In general, counties in the middle of the country have higher percentages of those who are married than counties near the coasts. In addition, the difference map and scatter plot show that a higher percentage of men tend to be married than women. This is likely due to the fact that there are slightly more women than men in the US, though it may also be influenced by how men and women are distributed among counties, as suggested by the strong purple outliers in the scatter plot.

Data source: http://factfinder2.census.gov/ (Table S1201)