If you want to know where charter schools are, don't look at a population map. Look at a map of state legislatures. Charter schools exist because a state passed a law allowing them, set the rules for who can open one, and decided how far to let the sector grow. That is why two states with similar populations can have wildly different charter counts, and why some states have none at all.
We counted every active public school in the National Center for Education Statistics (NCES) file for SY 2024-25 and flagged the ones marked as charters. The result: 8,182 charter schools out of 97,501 public schools nationally, or about 8.4%. That national average hides enormous variation. In one place charters run more than half the system. In six states they don't exist. Below is where they concentrate, where they barely register, and why the pattern looks the way it does. If you're new to the model itself, our explainer on what a charter school is and how it differs from a traditional public school is a good starting point.
The Most Charter Schools by Count
Raw counts favor big states, and the leaderboard reflects it. The three states with the most people run the three largest charter sectors. But population isn't the whole story: Florida packs more charters into a smaller system than New York does into a larger one, and Arizona sits in the top four despite being a mid-size state.
| State | Charter schools | Share of state's public schools |
|---|---|---|
| California | 1,288 | 12.8% |
| Texas | 1,074 | 11.7% |
| Florida | 739 | 18.2% |
| Arizona | 562 | 25.7% |
| Michigan | 367 | 10.8% |
| New York | 351 | 7.2% |
| Ohio | 350 | 9.8% |
| Minnesota | 308 | 12.4% |
| Colorado | 270 | 14.1% |
| Wisconsin | 235 | 10.7% |
| North Carolina | 215 | 7.9% |
| Pennsylvania | 175 | 6.0% |
| Louisiana | 152 | 11.5% |
| Utah | 144 | 13.4% |
| Indiana | 137 | 7.2% |
California leads with 1,288 charters, about one in eight of its public schools. Texas is close behind at 1,074. Both states authorized charters early and let the sector scale, and both are big enough that even a moderate share produces a large number. Florida is the interesting case in this group: at 739 charters it ranks third by count, but those schools are 18.2% of its public schools, the highest share of any of the count leaders. Florida has been an aggressive charter-expansion state, and the numbers show it.
Further down, Michigan (367), New York (351), and Ohio (350) cluster together, though they got there differently. Michigan's charters are 10.8% of its schools, Ohio's 9.8%, and New York's just 7.2%. New York's low share reflects a statewide cap on the number of charters that can operate, a policy lever several states use to keep the sector bounded. Minnesota, which passed the country's first charter law in 1991, runs 308. Colorado (270), Wisconsin (235), North Carolina (215), Pennsylvania (175), Louisiana (152), Utah (144), and Indiana (137) round out the top fifteen.
Where Charters Are the Biggest Share
Count tells you where the most charter buildings are. Share tells you how central charters are to a given system, and it reorders the list completely.
| State | Charter share | Detail |
|---|---|---|
| District of Columbia | 51.6% | 127 charters of 246 schools |
| Arizona | 25.7% | 562 charters |
| Florida | 18.2% | 739 charters |
| Nevada | 14.4% | |
| Colorado | 14.1% | 270 charters |
| Rhode Island | 13.7% | |
| Utah | 13.4% | 144 charters |
| California | 12.8% | 1,288 charters |
| Hawaii | 12.8% | |
| Minnesota | 12.4% | 308 charters |
| Louisiana | 11.5% | 152 charters |
Washington, D.C. is in a category of its own. More than half of its public schools, 127 of 246, are charters. No state comes close. D.C. built a large, well-funded charter sector alongside its traditional district over the past two decades, and the two now educate roughly comparable numbers of students. Arizona is the highest among the states at 25.7%, more than one in four schools. Arizona wrote one of the most permissive charter laws in the country, with a light authorizing process and no cap, and the sector grew accordingly.
The rest of the high-share list mixes small states where a modest count produces a big percentage (Rhode Island at 13.7%, Hawaii at 12.8%) with larger systems where charters are genuinely widespread (Florida, Colorado, California). Nevada sits at 14.4%. Louisiana at 11.5% deserves its own note: much of that share comes from New Orleans, which after Hurricane Katrina rebuilt its school system almost entirely around charters. For years the city ran essentially no traditional district schools, an experiment with no parallel anywhere else in the country.
The States With No Charters at All
Six states have zero charter schools in the data: South Dakota, North Dakota, Montana, Kentucky, Nebraska, and Vermont. Several more are effectively at zero: Kansas at 0.6%, Iowa at 0.5%, Virginia at 0.4%, Washington at 0.7%, West Virginia at 0.9%, Mississippi at 1.1%, and Alabama at 1.7%.
A zero here does not mean parents in those states never asked for charters. It means the state either never authorized them, authorized them only recently, or wrote a law restrictive enough that few or none have opened. Some of these states are among the newest to pass charter legislation, and it takes years for a first cohort of schools to clear approval and open their doors. Others have laws that cap the sector tightly or route authorizing power through bodies that have approved little. The point is that the absence is a legislative choice, not a market outcome. Where the law is friendly and the authorizing process is light, charters proliferate. Where it isn't, they don't appear, no matter the demand.
Reading the Map Honestly
Set the counts next to each other and a clear pattern emerges. Charter presence is a policy variable. It correlates with how a state chose to write its charter law, how many it allows, and how easy it made the approval process, far more than with population, geography, or how many families want an alternative. Arizona and D.C. sit at one end because their rules invite growth. The Plains and Mountain states and most of Appalachia sit at the other because their rules restrict or forbid it. Big states dominate the raw count for the obvious reason that big states have more of everything.
Worth saying plainly: this is a map of where charters exist, not a verdict on whether they work. A high charter share is not evidence that a state's schools are better, and a zero is not evidence they are worse. Charter quality varies enormously within every state that has them, and the research on outcomes is genuinely mixed and location-dependent. What the count does tell you is where the model has taken root, which is useful context whether you're a parent weighing options, a reporter covering school choice, or a researcher trying to understand why the national debate over charters plays out so differently from one state line to the next. If you want to go deeper into the underlying numbers, our full set of school-data studies lives at allk12 reports.
Data note: figures are allk12's own count of active public schools flagged as charters in the NCES Common Core of Data for SY 2024-25. Shares are charters as a percentage of each state's active public schools in the same file. Analysis is allk12's.
Sources
National Center for Education Statistics: Common Core of Data
National Center for Education Statistics: Public Charter School Enrollment
