| Rank | State | District | # of Charter School Students | # of All Public School Students | % Market Share |
| 1 | LA | New Orleans Public Schools | 19,636 | 34,984 | 56.1% |
| 2 | DC | District Of Columbia Public Schools | 25,729 | 71,280 | 36.1% |
| 3 | OH | Dayton Public Schools | 6,706 | 21,099 | 31.8% |
| 4 | MO | Kansas City, Missouri School District | 7,819 | 25,496 | 30.7% |
| 5 | MI | Southfield Public Schools | 3,837 | 12,808 | 30.0% |
| 6 | MO | Saint Louis Public Schools | 9,211 | 35,319 | 26.1% |
| 7 | MI | Pontiac School District | 2,705 | 10,394 | 26.0% |
| 8 | TX | DeSoto Independent School District | 3,042 | 12,001 | 25.3% |
| 9 | IN | Gary Community School Corporation | 4,073 | 16,975 | 24.0% |
| 10 | MI | Detroit Public Schools | 28,942 | 126,519 | 22.9% |