| Index | St. Charles | Iowa | National |
| Average Test Scores | n/a | 69% | 48% |
| Student/Teacher ratio | n/a | 13:1 | 16:1 |
| Total public schools | n/a | 1,101 | 79,221 |
| Total private schools | n/a | 208 | 24,874 |
| Total post-secondary schools | n/a | 96 | 7,963 |
| Index | St. Charles | Iowa | National |
| Completed 8th grade | 91.5% | 89.2% | 84.3% |
| Completed high school | 91.5% | 87.7% | 83.0% |
| Completed some college | 59.6% | 59.8% | 59.4% |
| Completed associate degree | 34.0% | 38.4% | 38.5% |
| Completed bachelors | 20.3% | 27.2% | 30.3% |
| Completed masters | 3.0% | 8.7% | 11.5% |
| Completed professional degree | 0.8% | 2.7% | 3.3% |
| Completed doctorate | 0.0% | 1.1% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in St. Charles. Using the proficiency score averages, the average test scores for St. Charles, IA schools is n/a. The average student to teacher ratio is n/a. In St. Charles, IA, an average of 91.5% of students have completed 8th grade and an average of 91.5% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Norwalk, IA | 11,804 | 81% | 67.7% |
| Martensdale, IA | 518 | 76% | 57.8% |
| Indianola, IA | 16,415 | 74% | 54.0% |
| Winterset, IA | 5,460 | 70% | 46.4% |
| Truro, IA | 554 | 68% | 40.6% |
| St. Charles, IA | 813 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Paraje, NM | 813 | 12% | 75.5% |
| Grove City, MN | 812 | 53% | 10.9% |
| Morrill, NE | 812 | 43% | 10.4% |
| Dexter, NY | 812 | 54% | 13.0% |
| Ellenboro, NC | 814 | 58% | 19.8% |
| St. Charles, IA | 813 | n/a |
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