Candidate Qualifying has closed, and the SOE's website lists the candidates for each of the 19 races:
https://www.duvalelections.com/Candidates-And-Committees/Candidate/Committee-Lists-Reports-Profiles Three races only drew a single candidate, all Republicans:
District 4 - Kevin Carrico
At-Large 3 - Nick Howland
At-Large 4 - Matt Carlucci
Districts 2, 3, 5, and 6 only have Republican candidates
Republicans have candidates in each of the 19 Council races
This is my best stab at deciphering the SOE's website. Some races show a candidate as "Active - Qualified" and "Active - Redesignated" on 2 separate lines (Tyrona Clark-Murray, D9, for example), and I don't know what that means. If it says "Active - Qualified" I included the person in my count.
Some notable names:
Ken Amaro is running as a Republican in District 1 to replace fellow former TV newsperson Joyce Morgan in District 1 (old Arlington area)
Both Kim Daniels and Brenda Priestly-Jackson are listed as "Withdrawn" from the D10 race.
Alberta Hipps [R] is running to rejoin the Council in District 14