| Index | St. Charles | Illinois | National |
| Average Test Scores | 57% | 33% | 48% |
| Student/Teacher ratio | 17:1 | 18:1 | 16:1 |
| Total public schools | 17 | 3,938 | 79,221 |
| Total private schools | 6 | 1,438 | 24,874 |
| Total post-secondary schools | n/a | 306 | 7,963 |
| Index | St. Charles | Illinois | National |
| Completed 8th grade | 92.3% | 86.2% | 84.3% |
| Completed high school | 91.6% | 84.7% | 83.0% |
| Completed some college | 75.0% | 61.8% | 59.4% |
| Completed associate degree | 53.4% | 40.7% | 38.5% |
| Completed bachelors | 47.0% | 32.9% | 30.3% |
| Completed masters | 17.3% | 12.7% | 11.5% |
| Completed professional degree | 3.4% | 3.4% | 3.3% |
| Completed doctorate | 1.6% | 1.2% | 1.3% |
There are a total of 17 public schools, 6 private schools and n/a post-secondary schools in St. Charles. Using the proficiency score averages, the average test scores for St. Charles, IL schools is 57%. The average student to teacher ratio is 17:1. In St. Charles, IL, an average of 92.3% of students have completed 8th grade and an average of 91.6% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| South Barrington, IL | 4,963 | 69% | 42.7% |
| Naperville, IL | 147,734 | 65% | 35.1% |
| Campton Hills, IL | 10,962 | 61% | 26.0% |
| Glen Ellyn, IL | 27,741 | 59% | 23.0% |
| Schaumburg, IL | 73,392 | 56% | 17.6% |
| St. Charles, IL | 32,612 | 57% | 19.0% |
| City | Population | Avg. Test Scores | National Avg. |
| Uniondale, NY | 32,621 | 55% | 14.9% |
| Helena, MT | 32,655 | 50% | 4.7% |
| Manitowoc, WI | 32,558 | 35% | 27.3% |
| Matthews, NC | 32,682 | 67% | 38.5% |
| Lawndale, CA | 32,533 | 41% | 15.5% |
| St. Charles, IL | 32,612 | 57% | 19.0% |
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