| Index | Stillman Valley | Illinois | National |
| Average Test Scores | 40% | 33% | 48% |
| Student/Teacher ratio | 24:1 | 18:1 | 16:1 |
| Total public schools | 3 | 3,938 | 79,221 |
| Total private schools | n/a | 1,438 | 24,874 |
| Total post-secondary schools | n/a | 306 | 7,963 |
| Index | Stillman Valley | Illinois | National |
| Completed 8th grade | 91.3% | 86.2% | 84.3% |
| Completed high school | 90.9% | 84.7% | 83.0% |
| Completed some college | 57.2% | 61.8% | 59.4% |
| Completed associate degree | 34.1% | 40.7% | 38.5% |
| Completed bachelors | 23.6% | 32.9% | 30.3% |
| Completed masters | 9.1% | 12.7% | 11.5% |
| Completed professional degree | 0.3% | 3.4% | 3.3% |
| Completed doctorate | 0.0% | 1.2% | 1.3% |
There are a total of 3 public schools, n/a private schools and n/a post-secondary schools in Stillman Valley. Using the proficiency score averages, the average test scores for Stillman Valley, IL schools is 40%. The average student to teacher ratio is 24:1. In Stillman Valley, IL, an average of 91.3% of students have completed 8th grade and an average of 90.9% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Pecatonica, IL | 1,957 | 57% | 19.4% |
| Byron, IL | 3,607 | 55% | 14.6% |
| Creston, IL | 535 | 37% | 22.9% |
| Winnebago, IL | 3,539 | 35% | 27.1% |
| Monroe Center, IL | 384 | 28% | 41.7% |
| Stillman Valley, IL | 1,348 | 40% | 16.7% |
| City | Population | Avg. Test Scores | National Avg. |
| Penhook, VA | 1,347 | 87% | 81.3% |
| Mancos, CO | 1,349 | 50% | 4.2% |
| Three Oaks, MI | 1,347 | 45% | 7.3% |
| Colchester, IL | 1,347 | 26% | 46.4% |
| Brewster, MA | 1,347 | 62% | 29.2% |
| Stillman Valley, IL | 1,348 | 40% | 16.7% |
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