| Index | Newcastle | Washington | National |
| Average Test Scores | 68% | 54% | 48% |
| Student/Teacher ratio | 20:1 | 20:1 | 16:1 |
| Total public schools | 1 | 1,991 | 79,221 |
| Total private schools | n/a | 548 | 24,874 |
| Total post-secondary schools | n/a | 147 | 7,963 |
| Index | Newcastle | Washington | National |
| Completed 8th grade | 97.2% | 87.5% | 84.3% |
| Completed high school | 97.2% | 86.6% | 83.0% |
| Completed some college | 86.9% | 67.7% | 59.4% |
| Completed associate degree | 73.3% | 43.3% | 38.5% |
| Completed bachelors | 65.8% | 33.6% | 30.3% |
| Completed masters | 27.9% | 12.3% | 11.5% |
| Completed professional degree | 9.2% | 3.6% | 3.3% |
| Completed doctorate | 4.5% | 1.5% | 1.3% |
There are a total of 1 public schools, n/a private schools and n/a post-secondary schools in Newcastle. Using the proficiency score averages, the average test scores for Newcastle, WA schools is 68%. The average student to teacher ratio is 20:1. In Newcastle, WA, an average of 97.2% of students have completed 8th grade and an average of 97.2% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Medina, WA | 3,283 | 91% | 88.5% |
| Sammamish, WA | 65,265 | 86% | 78.2% |
| Mercer Island, WA | 25,820 | 85% | 77.8% |
| Redmond, WA | 67,959 | 83% | 73.1% |
| Fall City, WA | 2,357 | 78% | 63.0% |
| Newcastle, WA | 12,078 | 68% | 42.0% |
| City | Population | Avg. Test Scores | National Avg. |
| Haverstraw, NY | 12,076 | 24% | 50.0% |
| Riverview, MI | 12,085 | 42% | 12.2% |
| Spring Lake, NC | 12,093 | 35% | 27.2% |
| Enumclaw, WA | 12,062 | 61% | 27.1% |
| Middle Valley, TN | 12,100 | 54% | 12.8% |
| Newcastle, WA | 12,078 | 68% | 42.0% |
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