| Index | Onslow | Iowa | National |
| Average Test Scores | n/a | 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 | Onslow | Iowa | National |
| Completed 8th grade | 86.1% | 89.2% | 84.3% |
| Completed high school | 86.1% | 87.7% | 83.0% |
| Completed some college | 48.7% | 59.8% | 59.4% |
| Completed associate degree | 24.1% | 38.4% | 38.5% |
| Completed bachelors | 10.1% | 27.2% | 30.3% |
| Completed masters | 2.5% | 8.7% | 11.5% |
| Completed professional degree | 0.0% | 2.7% | 3.3% |
| Completed doctorate | 0.0% | 1.1% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in Onslow. Using the proficiency score averages, the average test scores for Onslow, IA schools is n/a. The average student to teacher ratio is n/a. In Onslow, IA, an average of 86.1% of students have completed 8th grade and an average of 86.1% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Cascade, IA | 2,104 | 87% | 81.3% |
| Monticello, IA | 3,843 | 75% | 56.6% |
| Oxford Junction, IA | 423 | 70% | 44.8% |
| Mechanicsville, IA | 983 | 65% | 34.4% |
| Wyoming, IA | 452 | 65% | 34.4% |
| Onslow, IA | 304 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Belfry, MT | 304 | 50% | 4.2% |
| Trapper Creek, AK | 304 | 50% | 4.2% |
| Ruby, SC | 304 | 52% | 8.3% |
| Milligan, NE | 303 | 50% | 4.2% |
| Mill Creek, OK | 303 | 32% | 32.8% |
| Onslow, IA | 304 | n/a |
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