| Index | Winthrop Harbor | Illinois | National |
| Average Test Scores | 43% | 33% | 48% |
| Student/Teacher ratio | 17:1 | 18:1 | 16:1 |
| Total public schools | 3 | 3,938 | 79,221 |
| Total private schools | n/a | 1,438 | 24,874 |
| Total post-secondary schools | n/a | 306 | 7,963 |
| Index | Winthrop Harbor | Illinois | National |
| Completed 8th grade | 86.9% | 86.2% | 84.3% |
| Completed high school | 85.6% | 84.7% | 83.0% |
| Completed some college | 64.0% | 61.8% | 59.4% |
| Completed associate degree | 37.2% | 40.7% | 38.5% |
| Completed bachelors | 28.1% | 32.9% | 30.3% |
| Completed masters | 9.1% | 12.7% | 11.5% |
| Completed professional degree | 1.4% | 3.4% | 3.3% |
| Completed doctorate | 0.7% | 1.2% | 1.3% |
There are a total of 3 public schools, n/a private schools and n/a post-secondary schools in Winthrop Harbor. Using the proficiency score averages, the average test scores for Winthrop Harbor, IL schools is 43%. The average student to teacher ratio is 17:1. In Winthrop Harbor, IL, an average of 86.9% of students have completed 8th grade and an average of 85.6% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Libertyville, IL | 20,300 | 71% | 48.7% |
| Lake Bluff, IL | 5,540 | 64% | 32.8% |
| Pleasant Prairie, WI | 20,969 | 60% | 24.7% |
| Bristol, WI | 5,079 | 56% | 15.6% |
| Old Mill Creek, IL | 200 | 55% | 14.6% |
| Winthrop Harbor, IL | 6,675 | 43% | 10.9% |
| City | Population | Avg. Test Scores | National Avg. |
| Barnhart, MO | 6,676 | 46% | 5.2% |
| Barnesville, GA | 6,673 | 31% | 35.8% |
| Logan, OH | 6,677 | 76% | 57.3% |
| Barrington, NJ | 6,678 | 46% | 4.2% |
| Eldridge, IA | 6,678 | 81% | 69.3% |
| Winthrop Harbor, IL | 6,675 | 43% | 10.9% |
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