| Index | Newcastle | California | National |
| Average Test Scores | 58% | 43% | 48% |
| Student/Teacher ratio | n/a | 20:1 | 16:1 |
| Total public schools | n/a | 8,308 | 79,221 |
| Total private schools | n/a | 3,438 | 24,874 |
| Total post-secondary schools | n/a | 1,085 | 7,963 |
| Index | Newcastle | California | National |
| Completed 8th grade | 91.7% | 81.1% | 84.3% |
| Completed high school | 91.7% | 79.8% | 83.0% |
| Completed some college | 66.7% | 61.5% | 59.4% |
| Completed associate degree | 37.9% | 39.8% | 38.5% |
| Completed bachelors | 24.6% | 32.0% | 30.3% |
| Completed masters | 6.5% | 11.9% | 11.5% |
| Completed professional degree | 1.1% | 3.9% | 3.3% |
| Completed doctorate | 0.0% | 1.6% | 1.3% |
There are a total of n/a 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, CA schools is 58%. The average student to teacher ratio is n/a. In Newcastle, CA, an average of 91.7% of students have completed 8th grade and an average of 91.7% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Granite Bay, CA | 22,818 | 74% | 54.0% |
| Folsom, CA | 79,584 | 70% | 45.6% |
| Loomis, CA | 6,802 | 69% | 44.3% |
| El Dorado Hills, CA | 47,107 | 68% | 42.0% |
| Shingle Springs, CA | 3,710 | 68% | 41.5% |
| Newcastle, CA | 1,360 | 58% | 20.1% |
| City | Population | Avg. Test Scores | National Avg. |
| Hays, NC | 1,360 | 38% | 20.3% |
| Sanborn, IA | 1,359 | 75% | 55.2% |
| Washburn, ND | 1,361 | 51% | 5.7% |
| Dayton, IN | 1,359 | 55% | 14.6% |
| Elkader, IA | 1,362 | 62% | 29.7% |
| Newcastle, CA | 1,360 | 58% | 20.1% |
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