Similarly discouraging is evidence that the pay gap actually increases with education level. Although workers of all genders typically earn more as a result of education, the disparity between men and women increases. While women who lack high school degrees make 80 percent as much as the average male dropout, women with graduate degrees make just 74 percent as much as their male peers.

There is a greater pay disparity between white men and women than there is between the genders in other ethnic and racial groups. Black women earn 90 percent of what black men make, but their pay is only 63 percent of the average white man's. Similarly, Hispanic women make 89 percent of what Hispanic men earn, but only 54 percent of what white men make.

In every state of the country, women make less money than men, but the disparities are significantly greater in some places.

Washington, D.C., where women make 90 cents for every dollar earned by men, comes closest to gender parity. Right behind the nation's capital is New York, where women earn an average of 87 percent as much as men.

At the bottom are Wyoming, Utah, and Louisiana, where women only earn 69, 67, and 65 percent as much as men, respectively.

The AAUW used the report to push for more policies aimed at reducing gender discrimination in the workplace. It highlighted proposals that forbid employers from asking prospective employees about their pay history as a possible way to prevent the hiring process from reinforcing existing disparities.