| Rank | Student | School | Opponent | Date | | FTM | FTA | FT% |
| 1 | | Newtown-Harris | N/A | 1/1/2009 | Class 1 | 33 | 35 | 94.3% |
| 2 | | Thayer | N/A | 1/1/2003 | Class 2 | 28 | 31 | 90.3% |
| 3 | | St. Pius X (Kansas City) | N/A | 1/1/1974 | Class 3A | 23 | 26 | 88.5% |
| 4 | | Ozark | N/A | 1/1/2003 | Class 4 | 53 | 60 | 88.3% |
| 5 | | Notre Dame (Cape Girardeau) | N/A | 1/1/2007 | Class 4 | 35 | 40 | 87.5% |
| 5 | | St. Francis Borgia | N/A | 1/1/2010 | Class 4 | 35 | 40 | 87.5% |
| 7 | | St. James | N/A | 1/1/1975 | Class 2A | 44 | 52 | 84.6% |