| Index | St. Charles | Michigan | National |
| Average Test Scores | 40% | 42% | 48% |
| Student/Teacher ratio | 18:1 | 22:1 | 16:1 |
| Total public schools | 5 | 3,421 | 79,221 |
| Total private schools | n/a | 835 | 24,874 |
| Total post-secondary schools | n/a | 196 | 7,963 |
| Index | St. Charles | Michigan | National |
| Completed 8th grade | 86.6% | 86.9% | 84.3% |
| Completed high school | 86.2% | 85.9% | 83.0% |
| Completed some college | 49.8% | 60.3% | 59.4% |
| Completed associate degree | 24.9% | 36.5% | 38.5% |
| Completed bachelors | 15.0% | 27.4% | 30.3% |
| Completed masters | 6.0% | 10.7% | 11.5% |
| Completed professional degree | 0.9% | 2.8% | 3.3% |
| Completed doctorate | 0.0% | 1.1% | 1.3% |
There are a total of 5 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, MI schools is 40%. The average student to teacher ratio is 18:1. In St. Charles, MI, an average of 86.6% of students have completed 8th grade and an average of 86.2% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Chesaning, MI | 2,356 | 58% | 21.5% |
| New Lothrop, MI | 635 | 55% | 15.1% |
| Hemlock, MI | 1,042 | 53% | 9.4% |
| Elsie, MI | 1,066 | 48% | 0.8% |
| Montrose, MI | 2,023 | 34% | 30.2% |
| St. Charles, MI | 2,101 | 40% | 17.7% |
| City | Population | Avg. Test Scores | National Avg. |
| Sturbridge, MA | 2,101 | 55% | 14.6% |
| Anza, CA | 2,101 | 32% | 34.4% |
| Blacksburg, SC | 2,101 | 47% | 2.1% |
| Elk Point, SD | 2,102 | 62% | 29.5% |
| Kentwood, LA | 2,102 | 62% | 28.3% |
| St. Charles, MI | 2,101 | 40% | 17.7% |
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