No woman has ever been a governor of these 23 US states:
California, Nevada, Idaho, Colorado, North Dakota, South Dakota, Minnesota, Iowa, Missouri, Arkansas, Wisconsin, Illinois, Tennessee, Mississippi, Indiana, Georgia, Florida, West Virginia, Virginia, Maryland, Pennsylvania, New York, Maine.
In 1925, Nellie Tayloe Ross became the first woman in the US to be elected governor, and since then 36 other women have served as governor, including Maggie Hassan, who serves as governor of New Hampshire.