List of first women mayors in the United States
After Kansas granted women the right to vote in municipal elections in February 1887, Susanna Madora Salter was elected mayor of Argonia, Kansas on April 4, 1887, and became the first female mayor in the United States. Salter had been nominated without her knowledge or consent, as a stunt intended to discourage women from participation in the political process.
Source: Wikipedia — List of first women mayors in the United States (CC BY-SA 4.0)