| Index | Colby | Kansas | National |
| Average Test Scores | 28% | 35% | 48% |
| Student/Teacher ratio | 14:1 | 14:1 | 16:1 |
| Total public schools | 3 | 970 | 79,221 |
| Total private schools | 2 | 190 | 24,874 |
| Total post-secondary schools | 1 | 86 | 7,963 |
| Index | Colby | Kansas | National |
| Completed 8th grade | 89.6% | 87.4% | 84.3% |
| Completed high school | 89.0% | 86.1% | 83.0% |
| Completed some college | 65.1% | 63.7% | 59.4% |
| Completed associate degree | 40.8% | 39.8% | 38.5% |
| Completed bachelors | 25.7% | 31.6% | 30.3% |
| Completed masters | 9.9% | 11.4% | 11.5% |
| Completed professional degree | 2.2% | 3.0% | 3.3% |
| Completed doctorate | 0.4% | 1.2% | 1.3% |
There are a total of 3 public schools, 2 private schools and 1 post-secondary schools in Colby. Using the proficiency score averages, the average test scores for Colby, KS schools is 28%. The average student to teacher ratio is 14:1. In Colby, KS, an average of 89.6% of students have completed 8th grade and an average of 89.0% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Colby, KS | 5,426 | 28% | 41.7% |
| City | Population | Avg. Test Scores | National Avg. |
| Blaine, WA | 5,427 | 49% | 2.3% |
| Jonesboro, GA | 5,428 | 31% | 35.9% |
| Blauvelt, NY | 5,423 | 55% | 15.1% |
| Carrizo Springs, TX | 5,421 | 40% | 17.7% |
| Northwood, OH | 5,420 | 55% | 14.1% |
| Colby, KS | 5,426 | 28% | 41.7% |
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