| Rank | State | District | # of Charter School Students | # of All Public School Students | % Market Share |
| 1 | LA | New Orleans Public Schools | 27,728 | 39,877 | 69.5% |
| 2 | OH | Youngstown City Schools | 7,170 | 13,258 | 54.1% |
| 3 | DC | District Of Columbia Public Schools | 29,366 | 74,996 | 39.2% |
| 4 | MI | Southfield Public Schools | 5,108 | 13,517 | 37.8% |
| 5 | MO | Kansas City, Missouri School District | 9,441 | 26,767 | 35.3% |
| 6 | IN | Gary Community School Corporation | 4,834 | 15,995 | 30.2% |
| 7 | OH | Dayton Public Schools | 6,052 | 20,226 | 29.9% |
| 8 | OH | Toledo Public Schools | 9,390 | 31,667 | 29.7% |
| 9 | MO | Saint Louis Public Schools | 10,406 | 35,490 | 29.3% |
| 10 | MI | Detroit Public Schools | 31,267 | 109,924 | 28.4% |