| Index | Mercedes | Texas | National |
| Average Test Scores | 40% | 47% | 48% |
| Student/Teacher ratio | 18:1 | 14:1 | 16:1 |
| Total public schools | 16 | 7,418 | 79,221 |
| Total private schools | 1 | 1,267 | 24,874 |
| Total post-secondary schools | n/a | 463 | 7,963 |
| Index | Mercedes | Texas | National |
| Completed 8th grade | 62.6% | 79.3% | 84.3% |
| Completed high school | 60.2% | 77.8% | 83.0% |
| Completed some college | 36.1% | 57.3% | 59.4% |
| Completed associate degree | 17.6% | 34.9% | 38.5% |
| Completed bachelors | 12.5% | 28.1% | 30.3% |
| Completed masters | 3.4% | 9.6% | 11.5% |
| Completed professional degree | 0.6% | 2.6% | 3.3% |
| Completed doctorate | 0.5% | 1.1% | 1.3% |
There are a total of 16 public schools, 1 private schools and n/a post-secondary schools in Mercedes. Using the proficiency score averages, the average test scores for Mercedes, TX schools is 40%. The average student to teacher ratio is 18:1. In Mercedes, TX, an average of 62.6% of students have completed 8th grade and an average of 60.2% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Combes, TX | 3,016 | 65% | 34.4% |
| Harlingen, TX | 65,028 | 48% | 0.7% |
| San Juan, TX | 36,759 | 48% | 0.5% |
| Alamo, TX | 19,851 | 47% | 1.5% |
| Weslaco, TX | 41,103 | 46% | 4.0% |
| Mercedes, TX | 16,561 | 40% | 16.4% |
| City | Population | Avg. Test Scores | National Avg. |
| Country Club Hills, IL | 16,564 | 16% | 66.9% |
| Gainesville, TX | 16,557 | 36% | 26.0% |
| Abington, MA | 16,557 | 57% | 19.1% |
| Lemay, MO | 16,565 | 42% | 12.5% |
| Washington, IL | 16,555 | 44% | 8.2% |
| Mercedes, TX | 16,561 | 40% | 16.4% |
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