Among African-Americans, married women generally have higher incomes than never-married women
Among African-Americans, the median income of married women living with their spouses is 35 percent more than that of peers whose spouses are absent, 60 percent more than that of those who never married, and 9 percent more than that of divorced women.
Median income of African-American women, by marital status, in 2010 dollars

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