| Index | Newcastle | Maine | National |
| Average Test Scores | n/a | 45% | 48% |
| Student/Teacher ratio | n/a | 14:1 | 16:1 |
| Total public schools | n/a | 345 | 79,221 |
| Total private schools | n/a | 89 | 24,874 |
| Total post-secondary schools | n/a | 45 | 7,963 |
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| Index | Newcastle | Maine | National |
| Completed 8th grade | 93.4% | 88.3% | 84.3% |
| Completed high school | 93.4% | 86.8% | 83.0% |
| Completed some college | 77.9% | 58.8% | 59.4% |
| Completed associate degree | 61.3% | 39.0% | 38.5% |
| Completed bachelors | 54.9% | 29.3% | 30.3% |
| Completed masters | 24.6% | 10.5% | 11.5% |
| Completed professional degree | 8.6% | 3.0% | 3.3% |
| Completed doctorate | 1.0% | 1.3% | 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, ME schools is n/a. The average student to teacher ratio is n/a. In Newcastle, ME, an average of 93.4% of students have completed 8th grade and an average of 93.4% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Damariscotta, ME | 1,352 | 57% | 17.7% |
| Boothbay Harbor, ME | 1,087 | 49% | 1.0% |
| Farmingdale, ME | 2,451 | 45% | 7.3% |
| Gardiner, ME | 5,670 | 44% | 9.4% |
| Richmond, ME | 1,740 | 36% | 24.3% |
| Newcastle, ME | 643 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Monroe, OR | 643 | 47% | 1.6% |
| Fielding, UT | 643 | 57% | 18.8% |
| Morris, NY | 643 | 52% | 8.3% |
| Park City, KY | 643 | 46% | 5.2% |
| Zephyr Cove, NV | 642 | 47% | 2.1% |
| Newcastle, ME | 643 | n/a |
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