Married white families have higher incomes
Among whites, the median family income of single men is more than three-fifths of the median married-family income; for single women, it’s more than two-fifths. Even among single-income married families, the median family income is still higher than that of unmarried individuals.
Median income of white families, by family type, in 2010 dollars

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