| Index | Sully | Iowa | National |
| Average Test Scores | 81% | 69% | 48% |
| Student/Teacher ratio | n/a | 13:1 | 16:1 |
| Total public schools | n/a | 1,101 | 79,221 |
| Total private schools | n/a | 208 | 24,874 |
| Total post-secondary schools | n/a | 96 | 7,963 |
| Index | Sully | Iowa | National |
| Completed 8th grade | 95.6% | 89.2% | 84.3% |
| Completed high school | 91.3% | 87.7% | 83.0% |
| Completed some college | 47.9% | 59.8% | 59.4% |
| Completed associate degree | 27.7% | 38.4% | 38.5% |
| Completed bachelors | 15.3% | 27.2% | 30.3% |
| Completed masters | 6.6% | 8.7% | 11.5% |
| Completed professional degree | 0.9% | 2.7% | 3.3% |
| Completed doctorate | 0.3% | 1.1% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in Sully. Using the proficiency score averages, the average test scores for Sully, IA schools is 81%. The average student to teacher ratio is n/a. In Sully, IA, an average of 95.6% of students have completed 8th grade and an average of 91.3% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Pella, IA | 10,279 | 84% | 75.6% |
| Grinnell, IA | 9,069 | 79% | 64.6% |
| Monroe, IA | 1,810 | 78% | 63.0% |
| New Sharon, IA | 1,187 | 72% | 50.0% |
| Newton, IA | 15,160 | 69% | 43.6% |
| Sully, IA | 962 | 81% | 69.4% |
| City | Population | Avg. Test Scores | National Avg. |
| Highland, WI | 962 | 36% | 26.0% |
| Clarkfield, MN | 962 | 80% | 66.7% |
| Anacoco, LA | 962 | 90% | 87.0% |
| Cotton Valley, LA | 962 | 67% | 39.6% |
| Schurz, NV | 962 | 20% | 58.3% |
| Sully, IA | 962 | 81% | 69.4% |
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