Of the 50 states, Florida’s prekindergarten program has the highest percent of 4-year-olds enrolled in the early learning programs. Only Washington D.C. has a higher percentage. Nearly 175,000 little students attended in 2017-18 — 77 percent of Florida’s 4-year-olds. That’s according to a 2018 analysis called “The State of Preschool 2018.”