| Index | Portland | Connecticut | National |
| Average Test Scores | 61% | 53% | 48% |
| Student/Teacher ratio | 12:1 | 14:1 | 16:1 |
| Total public schools | 5 | 654 | 79,221 |
| Total private schools | n/a | 207 | 24,874 |
| Total post-secondary schools | n/a | 81 | 7,963 |
| Index | Portland | Connecticut | National |
| Completed 8th grade | 88.0% | 88.0% | 84.3% |
| Completed high school | 87.3% | 86.9% | 83.0% |
| Completed some college | 55.8% | 62.9% | 59.4% |
| Completed associate degree | 41.6% | 45.5% | 38.5% |
| Completed bachelors | 31.0% | 38.0% | 30.3% |
| Completed masters | 10.7% | 16.8% | 11.5% |
| Completed professional degree | 1.5% | 4.6% | 3.3% |
| Completed doctorate | 0.5% | 1.7% | 1.3% |
There are a total of 5 public schools, n/a private schools and n/a post-secondary schools in Portland. Using the proficiency score averages, the average test scores for Portland, CT schools is 61%. The average student to teacher ratio is 12:1. In Portland, CT, an average of 88.0% of students have completed 8th grade and an average of 87.3% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Cheshire Village, CT | 6,491 | 78% | 62.0% |
| Chester Center, CT | 1,731 | 77% | 60.4% |
| Higganum, CT | 1,763 | 75% | 55.2% |
| Deep River Center, CT | 2,638 | 70% | 44.8% |
| Plantsville, CT | 1,923 | 70% | 44.8% |
| Portland, CT | 5,937 | 61% | 26.3% |
| City | Population | Avg. Test Scores | National Avg. |
| Hilmar-Irwin, CA | 5,937 | 40% | 16.9% |
| Pevely, MO | 5,937 | 47% | 2.1% |
| Lake Mills, WI | 5,936 | 48% | 0.7% |
| Taylor, PA | 5,935 | 50% | 4.2% |
| Sunbury, OH | 5,934 | 79% | 65.3% |
| Portland, CT | 5,937 | 61% | 26.3% |
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