| Index | St. Charles | Minnesota | National |
| Average Test Scores | 66% | 52% | 48% |
| Student/Teacher ratio | 17:1 | 16:1 | 16:1 |
| Total public schools | 2 | 2,224 | 79,221 |
| Total private schools | n/a | 477 | 24,874 |
| Total post-secondary schools | n/a | 140 | 7,963 |
| Index | St. Charles | Minnesota | National |
| Completed 8th grade | 93.5% | 90.5% | 84.3% |
| Completed high school | 91.9% | 89.5% | 83.0% |
| Completed some college | 67.0% | 66.9% | 59.4% |
| Completed associate degree | 37.9% | 45.2% | 38.5% |
| Completed bachelors | 24.3% | 34.2% | 30.3% |
| Completed masters | 7.8% | 11.5% | 11.5% |
| Completed professional degree | 0.6% | 3.5% | 3.3% |
| Completed doctorate | 0.3% | 1.4% | 1.3% |
There are a total of 2 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, MN schools is 66%. The average student to teacher ratio is 17:1. In St. Charles, MN, an average of 93.5% of students have completed 8th grade and an average of 91.9% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Chatfield, MN | 2,690 | 69% | 42.7% |
| Elgin, MN | 1,189 | 68% | 41.1% |
| Plainview, MN | 3,292 | 66% | 37.0% |
| Eyota, MN | 2,183 | 62% | 28.1% |
| Lewiston, MN | 1,828 | 61% | 26.6% |
| St. Charles, MN | 3,749 | 66% | 36.5% |
| City | Population | Avg. Test Scores | National Avg. |
| West Liberty, IA | 3,750 | 59% | 22.6% |
| McGehee, AR | 3,748 | 32% | 33.3% |
| Fordyce, AR | 3,748 | 35% | 26.6% |
| Cresco, IA | 3,751 | 71% | 47.4% |
| Falmouth, MA | 3,751 | 61% | 26.6% |
| St. Charles, MN | 3,749 | 66% | 36.5% |
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