Democrat Donna Deegan has won the Jacksonville mayoral race, flipping the seat blue for the second time in 30 years. (CNN)

Deegan won Tue.'s runoff race with 52% of the vote, defeating Republican Daniel Davis by four points. (CBS47)

Jacksonville mayoral race results (CBS47): Deegan: 52%, 112K+ votes David: 48%, 103K+ votes

Deegan made history with her victory Tue. night: she will be the city's first woman mayor. (CNN)

Deegan will also be the first Democrat to hold the post since former Mayor Alvin Brown in 2015. (CNN)

Deegan's win is an upset for the GOP: Jacksonville is the most populous city in the country with a Republican mayor. (NBC)

Deegan celebrated her win in a speech Tue. night: "Everyone said it could not be done in Jacksonville, Florida."