| Index | Monmouth | Illinois | National |
| Average Test Scores | 25% | 33% | 48% |
| Student/Teacher ratio | 14:1 | 18:1 | 16:1 |
| Total public schools | 13 | 3,938 | 79,221 |
| Total private schools | 1 | 1,438 | 24,874 |
| Total post-secondary schools | 1 | 306 | 7,963 |
| Index | Monmouth | Illinois | National |
| Completed 8th grade | 77.5% | 86.2% | 84.3% |
| Completed high school | 76.1% | 84.7% | 83.0% |
| Completed some college | 46.2% | 61.8% | 59.4% |
| Completed associate degree | 27.3% | 40.7% | 38.5% |
| Completed bachelors | 20.7% | 32.9% | 30.3% |
| Completed masters | 7.6% | 12.7% | 11.5% |
| Completed professional degree | 3.9% | 3.4% | 3.3% |
| Completed doctorate | 2.8% | 1.2% | 1.3% |
There are a total of 13 public schools, 1 private schools and 1 post-secondary schools in Monmouth. Using the proficiency score averages, the average test scores for Monmouth, IL schools is 25%. The average student to teacher ratio is 14:1. In Monmouth, IL, an average of 77.5% of students have completed 8th grade and an average of 76.1% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Abingdon, IL | 3,570 | 27% | 43.2% |
| Alexis, IL | 862 | 27% | 43.8% |
| Galesburg, IL | 30,405 | 27% | 44.0% |
| Roseville, IL | 852 | 26% | 46.9% |
| Biggsville, IL | 438 | 20% | 58.9% |
| Monmouth, IL | 8,837 | 25% | 49.0% |
| City | Population | Avg. Test Scores | National Avg. |
| Glencoe, IL | 8,836 | 67% | 39.6% |
| Clarendon Hills, IL | 8,834 | 77% | 59.4% |
| Whitestown, IN | 8,842 | 75% | 56.3% |
| McFarland, WI | 8,845 | 33% | 31.7% |
| Glenwood, IL | 8,846 | 20% | 58.3% |
| Monmouth, IL | 8,837 | 25% | 49.0% |
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