| Index | Black Diamond | Washington | National |
| Average Test Scores | 66% | 54% | 48% |
| Student/Teacher ratio | 19:1 | 20:1 | 16:1 |
| Total public schools | 2 | 1,991 | 79,221 |
| Total private schools | n/a | 548 | 24,874 |
| Total post-secondary schools | n/a | 147 | 7,963 |
| Index | Black Diamond | Washington | National |
| Completed 8th grade | 90.6% | 87.5% | 84.3% |
| Completed high school | 89.9% | 86.6% | 83.0% |
| Completed some college | 64.0% | 67.7% | 59.4% |
| Completed associate degree | 38.0% | 43.3% | 38.5% |
| Completed bachelors | 28.2% | 33.6% | 30.3% |
| Completed masters | 11.4% | 12.3% | 11.5% |
| Completed professional degree | 3.2% | 3.6% | 3.3% |
| Completed doctorate | 2.1% | 1.5% | 1.3% |
There are a total of 2 public schools, n/a private schools and n/a post-secondary schools in Black Diamond. Using the proficiency score averages, the average test scores for Black Diamond, WA schools is 66%. The average student to teacher ratio is 19:1. In Black Diamond, WA, an average of 90.6% of students have completed 8th grade and an average of 89.9% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Lake Tapps, WA | 12,129 | 78% | 62.8% |
| Maple Valley, WA | 26,739 | 74% | 54.2% |
| Ravensdale, WA | 814 | 72% | 49.0% |
| Bonney Lake, WA | 21,247 | 70% | 45.1% |
| Newcastle, WA | 12,078 | 68% | 42.0% |
| Black Diamond, WA | 4,703 | 66% | 37.5% |
| City | Population | Avg. Test Scores | National Avg. |
| Mountain Grove, MO | 4,703 | 52% | 7.5% |
| Hyde Park, UT | 4,703 | 66% | 36.5% |
| Baxley, GA | 4,703 | 39% | 18.0% |
| St. Clair, MO | 4,702 | 42% | 12.2% |
| Soldotna, AK | 4,705 | 43% | 10.0% |
| Black Diamond, WA | 4,703 | 66% | 37.5% |
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