Married women have higher incomes than never-married women
The median income of married women living with their spouses is 21 percent more than that of married women whose spouses are absent and 36 percent more than that of never-married women. However, their median income is 10 percent less than that of divorced women.
Median income of women, by marital status, in 2010 dollars

Source: U.S. Census Bureau, Current Population Survey, 2011.