| Index | Barnwell | South Carolina | National |
| Average Test Scores | 40% | 47% | 48% |
| Student/Teacher ratio | 16:1 | 16:1 | 16:1 |
| Total public schools | 4 | 932 | 79,221 |
| Total private schools | 1 | 369 | 24,874 |
| Total post-secondary schools | n/a | 96 | 7,963 |
| Index | Barnwell | South Carolina | National |
| Completed 8th grade | 80.3% | 83.0% | 84.3% |
| Completed high school | 79.9% | 81.6% | 83.0% |
| Completed some college | 52.9% | 56.6% | 59.4% |
| Completed associate degree | 27.4% | 35.6% | 38.5% |
| Completed bachelors | 14.2% | 26.5% | 30.3% |
| Completed masters | 6.4% | 9.6% | 11.5% |
| Completed professional degree | 2.5% | 2.5% | 3.3% |
| Completed doctorate | 1.1% | 1.1% | 1.3% |
There are a total of 4 public schools, 1 private schools and n/a post-secondary schools in Barnwell. Using the proficiency score averages, the average test scores for Barnwell, SC schools is 40%. The average student to teacher ratio is 16:1. In Barnwell, SC, an average of 80.3% of students have completed 8th grade and an average of 79.9% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Blackville, SC | 2,037 | 47% | 2.1% |
| Denmark, SC | 3,231 | 33% | 31.3% |
| Williston, SC | 2,950 | 31% | 35.1% |
| Barnwell, SC | 4,373 | 40% | 16.9% |
| City | Population | Avg. Test Scores | National Avg. |
| Hampden, ME | 4,373 | 57% | 19.1% |
| La Joya, TX | 4,374 | 62% | 29.8% |
| South Hill, VA | 4,375 | 84% | 75.0% |
| Mary Esther, FL | 4,370 | 69% | 43.2% |
| Walhalla, SC | 4,377 | 54% | 11.8% |
| Barnwell, SC | 4,373 | 40% | 16.9% |
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