The DNC requires candidates to either have at least 1 per cent support in three qualifying polls or receive donations from at least 65,000 unique donors.
Most of the qualified have met both thresholds.
Hosted by NBC News, MSNBC and Telemundo, the two-night debates will take place on June 26 and 27 at the Adrienne Arsht Centre for the Performing Arts in Miami.
The event will be aired live across all three networks from 9 p.m. to 11 p.m.
NBC News plans on Friday to hold a random drawing assigning 10 candidates to each night.
It is the first of a dozen primary debates the DNC has planned.