Among whites, married women have higher incomes than never-married women
Among white women, the median income of those living with their spouses is 11 percent more than that of women whose spouses are absent and 29 percent more than that of never-married women. However, their median income is 12 percent less than that of divorced women.
Median income of white women, by marital status, in 2010 dollars

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