Charter school guide
What is a charter school?
A charter school is a tuition-free public school that runs under a written contract — the charter — instead of under a district’s standard rules. The contract sets what the school promises to achieve; in exchange the school gets freedom over staffing, curriculum, calendar and budget. If it breaks the promise, the contract can be revoked and the school closed.
By Charter Schools Directory editorial team· Reviewed September 28, 2026 · National figures from the 2024–25 Common Core of Data· Sources and methodology
How charter schools work
Every charter school exists because an authorizer approved its charter. Depending on the state, an authorizer can be a school district, a state board, a university, or a body created specifically for the job. The charter is a fixed-term performance contract — commonly three to five years — covering the school’s mission, who it will serve, what it will teach, how it will measure success and how it will be governed.
At the end of the term the authorizer reviews the school and renews, changes or revokes the charter. That renewal decision is the accountability mechanism that distinguishes a charter from a district school: a district school that underperforms is improved, while a charter school that underperforms can simply cease to exist.
Most charters are held by a non-profit board. Some boards contract a charter management organisation (CMO) or an education management organisation (EMO) to run the school day to day. The words that come with all this are worth knowing before you read a school’s own material — we keep a plain-English list in charter school terms explained.
Are charter schools really public schools?
Yes, in every way that affects a family at the door. A charter school is funded with public money, cannot charge tuition, cannot be religious, and cannot pick students on ability, income or behaviour. It must serve students with disabilities and English learners, and it must publish results.
Where charters differ is operational freedom. They are usually exempt from parts of the state education code and from district collective-bargaining agreements, which is how they can run a longer day, a different calendar, an unusual curriculum, or hire teachers on different terms.
The most common misunderstanding is about cost. If you have been searching for a “tuition-free charter school”, that phrase is a tautology: every public charter school is free to attend.
Applications, lotteries and waitlists
There is no catchment area to fall inside. Families apply directly to the school, usually in a window that opens months before the school year. If applications do not exceed seats, everyone who applied on time is admitted. If they do, the school runs a random lottery, and everyone else goes on a waitlist that moves as offers are declined.
Lotteries may include weighted preferences that state law allows — for siblings of current students, for children of staff, for students inside the district, or for students from low-income families. Those preferences change the odds, so they are worth reading before you apply. The mechanics, the dates and the mistakes that cost families a seat are in the charter school lottery guide.
How charter schools are funded
Charter schools receive public per-pupil funding that follows the student, plus federal programme money they qualify for. What they usually do not receive on the same terms is facilities funding: many charters rent their buildings out of the same per-pupil money that pays teachers, which is why a charter school’s building is often the most obvious difference from the district school down the road.
Funding rules vary sharply by state, and the gap between district and charter per-pupil revenue is one of the most contested numbers in education policy. Treat any single national figure you see — from either side of the argument — as a claim to check, not a fact.
Charter, district, magnet and private schools
| School type | Tuition | Who can attend | Run by |
|---|---|---|---|
| Charter | Free | Anyone who applies; lottery if oversubscribed | Non-profit board under a charter |
| District | Free | Assigned by address | The school district |
| Magnet | Free | Applies district-wide; may test or audition | The school district |
| Private | Paid | Admitted at the school’s discretion | Private owner or trust |
The comparison families actually agonise over is the first two rows, and it deserves more than a table: see charter schools vs public schools.
What the national data shows
Every figure below comes from the 2024–25 federal Common Core of Data, the same records behind every school page on this site.
- Open charter schools
- 8,068
- Students reported
- 3,957,681
- Median school size
- 362
- Median students per teacher
- 16.9
The typical charter school is small: half of them enrol fewer than 362 students, which is a fraction of a comprehensive district high school. Charter enrolment is also concentrated — California (1,276), Texas (1,056), Florida (734), Arizona (569), Michigan (368) hold the largest shares. The full breakdown is in how many charter schools are in each state.
A growing share of charters are not buildings at all. Fully online and hybrid charters serve students statewide, and they work very differently from a neighbourhood school — see online and cyber charter schools.
How to judge one charter school
The label tells you almost nothing about quality. These questions do:
- Who is the authorizer, and when is renewal? A school in its final charter year is a different proposition from one just renewed.
- Does the grade span go where you need it to? A K–8 charter means finding a new school for ninth grade.
- How are students with disabilities and English learners served? Ask what is delivered in-house versus bought from the district.
- What is teacher turnover? Ask directly. It is the number schools least like to publish and the one that tells you most.
- Is transport provided? Many charters do not run buses, and a free school 40 minutes away is not free of cost.
Frequently asked questions
Are charter schools public schools?
Yes. Charter schools are tuition-free public schools of choice, funded with public money and open to any student who applies, subject to the school’s enrolment rules. They cannot be religious and cannot select students on academic grounds the way a private school can.
Do charter schools charge tuition?
No. A public charter school does not charge tuition. Families may still meet ordinary school costs such as uniforms, trips, or supplies, exactly as they would at a district school.
Who owns and runs a charter school?
A non-profit board usually holds the charter. Some boards contract a management organisation to run day-to-day operations. Whoever operates the school, an authorizer holds the contract and can close the school if it fails to meet it.
How do students get in?
Families apply directly to the school. If more students apply than there are seats, admission is generally decided by a lottery under the rules for that school and state, with a waitlist for the rest.
Are charter schools better than district schools?
Neither type is better as a category. Quality varies school by school, and this directory publishes no rankings for that reason. Compare the grades served, the programme, the commute, the class-size figures and the school’s own reporting before deciding.
How many charter schools are there in the United States?
This directory lists 8,068 open charter schools across 47 states and territories from the 2024–25 federal school year, reporting 3,957,681 students in total.
Policy definitions checked against the U.S. Department of Education’s National Charter School Resource Center. National figures are from the 2024–25 Common Core of Data (Common Core of Data (NCES), via Education Data Portal, Urban Institute), accessed 2026-09-14. State laws and individual school policies vary; confirm anything that matters with the school and its authorizer.