| Index | Grass Lake | Michigan | National |
| Average Test Scores | 46% | 42% | 48% |
| Student/Teacher ratio | 16:1 | 22:1 | 16:1 |
| Total public schools | 3 | 3,421 | 79,221 |
| Total private schools | 1 | 835 | 24,874 |
| Total post-secondary schools | n/a | 196 | 7,963 |
| Index | Grass Lake | Michigan | National |
| Completed 8th grade | 93.0% | 86.9% | 84.3% |
| Completed high school | 92.5% | 85.9% | 83.0% |
| Completed some college | 68.6% | 60.3% | 59.4% |
| Completed associate degree | 36.4% | 36.5% | 38.5% |
| Completed bachelors | 25.1% | 27.4% | 30.3% |
| Completed masters | 9.2% | 10.7% | 11.5% |
| Completed professional degree | 1.5% | 2.8% | 3.3% |
| Completed doctorate | 0.4% | 1.1% | 1.3% |
There are a total of 3 public schools, 1 private schools and n/a post-secondary schools in Grass Lake. Using the proficiency score averages, the average test scores for Grass Lake, MI schools is 46%. The average student to teacher ratio is 16:1. In Grass Lake, MI, an average of 93.0% of students have completed 8th grade and an average of 92.5% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Chelsea, MI | 5,378 | 65% | 36.1% |
| Brooklyn, MI | 1,088 | 51% | 6.3% |
| Pinckney, MI | 2,132 | 51% | 6.3% |
| Manchester, MI | 2,170 | 50% | 4.2% |
| Napoleon, MI | 905 | 49% | 2.4% |
| Grass Lake, MI | 1,331 | 46% | 4.9% |
| City | Population | Avg. Test Scores | National Avg. |
| Chocowinity, NC | 1,331 | 45% | 6.9% |
| Marathon City, WI | 1,331 | 49% | 1.4% |
| Point Marion, PA | 1,331 | 49% | 1.6% |
| Dryden, MI | 1,331 | 37% | 22.9% |
| Smithville, OH | 1,330 | 60% | 24.5% |
| Grass Lake, MI | 1,331 | 46% | 4.9% |
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