| Index | Dahlgren | Illinois | National |
| Average Test Scores | 52% | 33% | 48% |
| Student/Teacher ratio | n/a | 18:1 | 16:1 |
| Total public schools | n/a | 3,938 | 79,221 |
| Total private schools | n/a | 1,438 | 24,874 |
| Total post-secondary schools | n/a | 306 | 7,963 |
| Index | Dahlgren | Illinois | National |
| Completed 8th grade | 96.0% | 86.2% | 84.3% |
| Completed high school | 91.2% | 84.7% | 83.0% |
| Completed some college | 68.3% | 61.8% | 59.4% |
| Completed associate degree | 42.1% | 40.7% | 38.5% |
| Completed bachelors | 24.4% | 32.9% | 30.3% |
| Completed masters | 9.5% | 12.7% | 11.5% |
| Completed professional degree | 4.6% | 3.4% | 3.3% |
| Completed doctorate | 3.4% | 1.2% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in Dahlgren. Using the proficiency score averages, the average test scores for Dahlgren, IL schools is 52%. The average student to teacher ratio is n/a. In Dahlgren, IL, an average of 96.0% of students have completed 8th grade and an average of 91.2% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Ewing, IL | 320 | 47% | 2.1% |
| Opdyke, IL | 303 | 42% | 12.5% |
| McLeansboro, IL | 2,539 | 39% | 19.3% |
| Bluford, IL | 662 | 34% | 29.2% |
| Wayne City, IL | 934 | 31% | 35.4% |
| Dahlgren, IL | 699 | 52% | 8.3% |
| City | Population | Avg. Test Scores | National Avg. |
| Junction City, LA | 699 | 45% | 7.3% |
| Millerstown, PA | 699 | 64% | 33.0% |
| Miller, MO | 699 | 40% | 17.7% |
| Cohutta, GA | 700 | 65% | 34.4% |
| Antwerp, NY | 698 | 60% | 25.0% |
| Dahlgren, IL | 699 | 52% | 8.3% |
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