| Index | Decatur | Michigan | National |
| Average Test Scores | 36% | 42% | 48% |
| Student/Teacher ratio | 15:1 | 22:1 | 16:1 |
| Total public schools | 4 | 3,421 | 79,221 |
| Total private schools | n/a | 835 | 24,874 |
| Total post-secondary schools | n/a | 196 | 7,963 |
| Index | Decatur | Michigan | National |
| Completed 8th grade | 75.3% | 86.9% | 84.3% |
| Completed high school | 73.2% | 85.9% | 83.0% |
| Completed some college | 39.2% | 60.3% | 59.4% |
| Completed associate degree | 18.1% | 36.5% | 38.5% |
| Completed bachelors | 12.4% | 27.4% | 30.3% |
| Completed masters | 3.3% | 10.7% | 11.5% |
| Completed professional degree | 0.5% | 2.8% | 3.3% |
| Completed doctorate | 0.2% | 1.1% | 1.3% |
There are a total of 4 public schools, n/a private schools and n/a post-secondary schools in Decatur. Using the proficiency score averages, the average test scores for Decatur, MI schools is 36%. The average student to teacher ratio is 15:1. In Decatur, MI, an average of 75.3% of students have completed 8th grade and an average of 73.2% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Mattawan, MI | 2,567 | 64% | 32.3% |
| Paw Paw, MI | 3,416 | 48% | 0.6% |
| Lawton, MI | 1,533 | 44% | 7.8% |
| Marcellus, MI | 1,140 | 44% | 8.7% |
| Lawrence, MI | 918 | 41% | 13.9% |
| Decatur, MI | 1,935 | 36% | 25.5% |
| City | Population | Avg. Test Scores | National Avg. |
| Edmonton, KY | 1,936 | 35% | 27.1% |
| Langdon, ND | 1,936 | 43% | 9.9% |
| LaCoste, TX | 1,936 | 53% | 10.4% |
| Osseo, WI | 1,934 | 37% | 22.9% |
| Kingsley, MI | 1,933 | 57% | 18.4% |
| Decatur, MI | 1,935 | 36% | 25.5% |
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