| Index | Onaga | Kansas | National |
| Average Test Scores | 40% | 35% | 48% |
| Student/Teacher ratio | n/a | 14:1 | 16:1 |
| Total public schools | n/a | 970 | 79,221 |
| Total private schools | n/a | 190 | 24,874 |
| Total post-secondary schools | n/a | 86 | 7,963 |
| Index | Onaga | Kansas | National |
| Completed 8th grade | 94.8% | 87.4% | 84.3% |
| Completed high school | 92.8% | 86.1% | 83.0% |
| Completed some college | 53.4% | 63.7% | 59.4% |
| Completed associate degree | 30.0% | 39.8% | 38.5% |
| Completed bachelors | 23.6% | 31.6% | 30.3% |
| Completed masters | 5.8% | 11.4% | 11.5% |
| Completed professional degree | 2.5% | 3.0% | 3.3% |
| Completed doctorate | 1.1% | 1.2% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in Onaga. Using the proficiency score averages, the average test scores for Onaga, KS schools is 40%. The average student to teacher ratio is n/a. In Onaga, KS, an average of 94.8% of students have completed 8th grade and an average of 92.8% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Westmoreland, KS | 704 | 47% | 2.1% |
| Frankfort, KS | 729 | 42% | 12.0% |
| Onaga, KS | 709 | 40% | 17.2% |
| City | Population | Avg. Test Scores | National Avg. |
| Welling, OK | 709 | 32% | 33.3% |
| Plankinton, SD | 709 | 39% | 18.2% |
| Hartford, IA | 709 | 72% | 49.0% |
| Conway, MO | 709 | 39% | 18.2% |
| Edgemont, SD | 708 | 42% | 12.0% |
| Onaga, KS | 709 | 40% | 17.2% |
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