Debate its size or causes, but evidence suggests the wage gap between men and women is real.

Yet, wages don’t fully convey how working women in America are doing—which is what the nonprofit  Institute for Women’s Policy Research seeks to better measure in a new report. To get a more accurate picture of the professional lives of American women, the researchers assigned each state a grade based on four equally weighted factors: the median annual earnings for full-time women workers, the gender earnings ratios among such workers, workforce participation and their share of higher-paying professional and managerial jobs.

What they found was that conditions for working women were generally best in the Northeast and Mid-Atlantic and worst in the South. Among states, Maryland ranked highest, followed by Massachusetts, both of which earned a B+ from IWPR. New Jersey was next, followed by Connecticut and New York, which earned B’s along with nearly a dozen others. Nineteen states earned C’s, 10 earned D’s, and five—Arkansas, Mississippi, Louisiana, Idaho and West Virginia—earned F’s. D.C. earned the highest rank of all, a solid A and a 5.33 score. The scores for states ranged from a low of 3.43 in West Virginia to a high of 4.72 in Maryland.

In all, 30 states have either seen no change or advanced since the last such report, in 2004, with New York and D.C. moving furthest along. New York rose from 19th place to 6th, while D.C. bested all states both times.

The gender wage gap likely exists for a number of reasons, but if it continues to close at the rate it has been narrowing since 1959, it will take another two decades before it is fully closed in any state, the first one being Florida. The last state gender wage gap would be eradicated another century and a half from now.