City Treasurer Tishaura Jones said she was in a state of nervous excitement as she paid the $1,300 filing fee — 1 percent of the mayor’s salary.

The candidates:

• French, known nationally as an activist for his participation in the Ferguson protests and his commentary on Twitter, has been an alderman for nine years and has long been a vocal critic of Slay.

French has said his campaign will center on neighborhood stability, increasing job opportunities and finding uses for abandoned buildings.

• Reed has been on the Board of Aldermen since 1999, and he has served as president since 2007. He lost his first bid for mayor in the 2013 Democratic primary, falling more than 4,000 votes short of Slay.

On Monday, Reed said he will focus on crime. He called the city’s crime rate “the canary in the coal mine,” a signal that St. Louis has major structural problems, particularly in providing increased economic opportunities.

• Alderman Jeffrey Boyd, 22nd Ward, has served on the board since 2003. Boyd has previously run unsuccessfully for city treasurer and license collector.