| Index | Watertown | South Dakota | National |
| Average Test Scores | 59% | 48% | 48% |
| Student/Teacher ratio | 16:1 | 14:1 | 16:1 |
| Total public schools | 10 | 340 | 79,221 |
| Total private schools | 6 | 76 | 24,874 |
| Total post-secondary schools | 1 | 25 | 7,963 |
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| Index | Watertown | South Dakota | National |
| Completed 8th grade | 90.1% | 89.1% | 84.3% |
| Completed high school | 88.1% | 86.8% | 83.0% |
| Completed some college | 54.3% | 60.4% | 59.4% |
| Completed associate degree | 33.9% | 38.5% | 38.5% |
| Completed bachelors | 20.9% | 27.5% | 30.3% |
| Completed masters | 3.5% | 8.1% | 11.5% |
| Completed professional degree | 0.9% | 2.5% | 3.3% |
| Completed doctorate | 0.1% | 1.2% | 1.3% |
There are a total of 10 public schools, 6 private schools and 1 post-secondary schools in Watertown. Using the proficiency score averages, the average test scores for Watertown, SD schools is 59%. The average student to teacher ratio is 16:1. In Watertown, SD, an average of 90.1% of students have completed 8th grade and an average of 88.1% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Castlewood, SD | 599 | 57% | 18.2% |
| Florence, SD | 378 | 46% | 5.2% |
| Waverly, SD | 53 | 32% | 34.0% |
| Watertown, SD | 22,909 | 59% | 22.5% |
| City | Population | Avg. Test Scores | National Avg. |
| Villa Park, IL | 22,904 | 37% | 24.0% |
| Clinton, UT | 22,893 | 45% | 6.3% |
| Maple Heights, OH | 22,891 | 36% | 25.8% |
| Fairhope, AL | 22,887 | 69% | 44.3% |
| Nixa, MO | 22,872 | 61% | 27.3% |
| Watertown, SD | 22,909 | 59% | 22.5% |
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