| Index | Lanark | Illinois | National |
| Average Test Scores | 47% | 33% | 48% |
| Student/Teacher ratio | 18:1 | 18:1 | 16:1 |
| Total public schools | 2 | 3,938 | 79,221 |
| Total private schools | n/a | 1,438 | 24,874 |
| Total post-secondary schools | n/a | 306 | 7,963 |
| Index | Lanark | Illinois | National |
| Completed 8th grade | 87.7% | 86.2% | 84.3% |
| Completed high school | 86.7% | 84.7% | 83.0% |
| Completed some college | 53.4% | 61.8% | 59.4% |
| Completed associate degree | 24.1% | 40.7% | 38.5% |
| Completed bachelors | 17.8% | 32.9% | 30.3% |
| Completed masters | 5.3% | 12.7% | 11.5% |
| Completed professional degree | 1.3% | 3.4% | 3.3% |
| Completed doctorate | 0.0% | 1.2% | 1.3% |
There are a total of 2 public schools, n/a private schools and n/a post-secondary schools in Lanark. Using the proficiency score averages, the average test scores for Lanark, IL schools is 47%. The average student to teacher ratio is 18:1. In Lanark, IL, an average of 87.7% of students have completed 8th grade and an average of 86.7% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Chadwick, IL | 529 | 52% | 8.9% |
| Shannon, IL | 745 | 50% | 3.1% |
| Forreston, IL | 1,392 | 41% | 14.6% |
| Pearl City, IL | 831 | 41% | 15.6% |
| Polo, IL | 2,210 | 39% | 19.1% |
| Lanark, IL | 1,453 | 47% | 2.1% |
| City | Population | Avg. Test Scores | National Avg. |
| Silver Lake, KS | 1,453 | 50% | 4.7% |
| Morrice, MI | 1,453 | 35% | 28.1% |
| North Bend, NE | 1,453 | 62% | 29.2% |
| Stratford, WI | 1,454 | 48% | 0.3% |
| Griggsville, IL | 1,454 | 25% | 47.9% |
| Lanark, IL | 1,453 | 47% | 2.1% |
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