| Index | Lyndon | Illinois | National |
| Average Test Scores | n/a | 33% | 48% |
| Student/Teacher ratio | n/a | 18:1 | 16:1 |
| Total public schools | n/a | 3,938 | 79,221 |
| Total private schools | n/a | 1,438 | 24,874 |
| Total post-secondary schools | n/a | 306 | 7,963 |
| Index | Lyndon | Illinois | National |
| Completed 8th grade | 79.4% | 86.2% | 84.3% |
| Completed high school | 78.4% | 84.7% | 83.0% |
| Completed some college | 40.7% | 61.8% | 59.4% |
| Completed associate degree | 14.1% | 40.7% | 38.5% |
| Completed bachelors | 9.5% | 32.9% | 30.3% |
| Completed masters | 1.3% | 12.7% | 11.5% |
| Completed professional degree | 0.0% | 3.4% | 3.3% |
| Completed doctorate | 0.0% | 1.2% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in Lyndon. Using the proficiency score averages, the average test scores for Lyndon, IL schools is n/a. The average student to teacher ratio is n/a. In Lyndon, IL, an average of 79.4% of students have completed 8th grade and an average of 78.4% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Clinton, IA | 25,290 | 66% | 37.2% |
| Erie, IL | 1,865 | 49% | 1.7% |
| Morrison, IL | 3,850 | 36% | 25.7% |
| Tampico, IL | 771 | 35% | 28.1% |
| Fulton, IL | 3,255 | 34% | 29.5% |
| Lyndon, IL | 604 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Dexter, KS | 604 | 45% | 6.8% |
| Pleasant Hill, TN | 604 | 33% | 31.3% |
| Hershey, NE | 604 | 52% | 8.3% |
| Hanover, KS | 604 | 53% | 9.4% |
| Leedey, OK | 603 | 32% | 32.8% |
| Lyndon, IL | 604 | n/a |
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