| Index | New Castle | Colorado | National |
| Average Test Scores | 37% | 39% | 48% |
| Student/Teacher ratio | 18:1 | 17:1 | 16:1 |
| Total public schools | 2 | 1,426 | 79,221 |
| Total private schools | 1 | 384 | 24,874 |
| Total post-secondary schools | n/a | 138 | 7,963 |
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| Index | New Castle | Colorado | National |
| Completed 8th grade | 83.6% | 87.9% | 84.3% |
| Completed high school | 83.6% | 87.1% | 83.0% |
| Completed some college | 68.9% | 69.3% | 59.4% |
| Completed associate degree | 39.5% | 47.1% | 38.5% |
| Completed bachelors | 29.1% | 38.7% | 30.3% |
| Completed masters | 9.2% | 14.3% | 11.5% |
| Completed professional degree | 2.0% | 3.9% | 3.3% |
| Completed doctorate | 1.7% | 1.6% | 1.3% |
There are a total of 2 public schools, 1 private schools and n/a post-secondary schools in New Castle. Using the proficiency score averages, the average test scores for New Castle, CO schools is 37%. The average student to teacher ratio is 18:1. In New Castle, CO, an average of 83.6% of students have completed 8th grade and an average of 83.6% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Silt, CO | 3,197 | 43% | 10.4% |
| Glenwood Springs, CO | 10,321 | 31% | 34.5% |
| Rifle, CO | 10,154 | 29% | 40.4% |
| New Castle, CO | 4,975 | 37% | 24.0% |
| City | Population | Avg. Test Scores | National Avg. |
| Wauchula, FL | 4,974 | 58% | 20.2% |
| Hamilton, MT | 4,973 | 43% | 11.5% |
| Glen Head, NY | 4,979 | 89% | 85.7% |
| Big Pine Key, FL | 4,970 | 83% | 71.9% |
| Farmington, ME | 4,969 | 41% | 15.3% |
| New Castle, CO | 4,975 | 37% | 24.0% |
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