The headline
US charter schools enrolled roughly 4.0 million students across 8,623 schools in 2024-25, about 8% of US public K-12 enrollment. The sector grew substantially over the 2017-2024 window in some states and stagnated or shrunk in others.
States where charters grew
The largest five-year charter growth, in absolute enrollment terms, occurred in Texas, Florida, Arizona, California (despite a moratorium debate), and the Carolinas. In Texas, several large charter networks (KIPP Texas, IDEA, Harmony, Uplift) added thousands of students each. In Florida, growth was distributed across many smaller charter operators. In Arizona, growth was concentrated in BASIS Charter Schools and several local networks.
States where charters shrunk
A handful of states saw charter enrollment decline between 2017 and 2022. Causes varied: in some cases, charter authorizers closed underperforming schools without authorizing replacements; in others, post-COVID disenrollment hit charters harder than district schools; in still others, state-level political shifts led to charter caps or moratoria.
What charter growth predicts
Charter growth is one of the clearest leading indicators of where US K-12 is heading in any given state. States with active charter pipelines (Texas, Florida, Arizona) tend to be the same states where families are relocating and where school-choice politics is shaping district behavior. States with stagnant charter sectors tend to have more stable but less innovative district landscapes.
For families, the charter share in a given state predicts how much practical choice they have over their child's school. For policymakers, charter trajectory predicts the political and financial pressure their district sector will face in the next 5-10 years.
Methodology
Source: NCES Common Core of Data 2017-18 and 2024-25, charter-status indicator. Enrollment changes computed at the state level. Schools that converted from district to charter status (or vice versa) during the window are flagged separately.