| | Keystone, SD | Custer, SD | United States |
| Expend. per Student | $10,333 | $13,774 | $15,905 |
| Educ. Expend. per Student | $9,859 | $12,279 | $13,142 |
| Instr. Expend. per Student | $5,774 | $6,926 | $7,999 |
| Pupil/Teacher Ratio | 15.14 | 12.3 | 16.23 |
| Students per Librarian | 1044 | 0 | 4573 |
| Students per Counselor | 407 | 301 | 530 |
| Grade School Educ. | 2.8% | 2.1% | 4.8% |
| Some High School Educ. | 6.8% | 4.1% | 6.3% |
| High School Educ. | 90.4% | 93.8% | 88.9% |
| Some College Educ. | 12.1% | 19.5% | 20.0% |
| 2 yr College Grad. | 10.3% | 8.0% | 8.7% |
| 4 yr College Grad. | 16.7% | 29.4% | 33.7% |
| Masters Grad. | 2.5% | 7.7% | 9.3% |
| Professional Degree | 0.4% | 1.3% | 2.2% |
| Doctorate Degree | 0.7% | 1.2% | 1.5% |