How many females have appeared on U.S. currency?

Aside from the female representations of Justice and Liberty, only three women have been so commemorated:

Martha Washington, on the face of the 1886 and 1891 $1 silver certificates and on the reverse of the 1896 silver certificate;

Pocahontas, on the back of the 1875 $20 bill;

and women’s suffrage leader Susan B. Anthony, on the 1979 $1 coin.