| Index | St. Charles | Idaho | National |
| Average Test Scores | n/a | 47% | 48% |
| Student/Teacher ratio | n/a | 17:1 | 16:1 |
| Total public schools | n/a | 446 | 79,221 |
| Total private schools | n/a | 83 | 24,874 |
| Total post-secondary schools | n/a | 34 | 7,963 |
| Index | St. Charles | Idaho | National |
| Completed 8th grade | 98.5% | 85.7% | 84.3% |
| Completed high school | 98.5% | 84.8% | 83.0% |
| Completed some college | 54.4% | 62.4% | 59.4% |
| Completed associate degree | 11.8% | 35.6% | 38.5% |
| Completed bachelors | 11.8% | 26.2% | 30.3% |
| Completed masters | 4.4% | 8.4% | 11.5% |
| Completed professional degree | 0.0% | 2.6% | 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, ID schools is n/a. The average student to teacher ratio is n/a. In St. Charles, ID, an average of 98.5% of students have completed 8th grade and an average of 98.5% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Paris, ID | 667 | 52% | 8.3% |
| Montpelier, ID | 2,512 | 46% | 4.2% |
| St. Charles, ID | 160 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Tomales, CA | 160 | 36% | 25.0% |
| Jordan Valley, OR | 160 | 53% | 9.4% |
| Fort Smith, MT | 160 | 30% | 37.5% |
| Mount Eaton, OH | 160 | 72% | 50.0% |
| De Smet, ID | 160 | 10% | 79.2% |
| St. Charles, ID | 160 | n/a |
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