| Index | Cardiff | Alabama | National |
| Average Test Scores | n/a | 44% | 48% |
| Student/Teacher ratio | n/a | 15:1 | 16:1 |
| Total public schools | n/a | 1,307 | 79,221 |
| Total private schools | n/a | 353 | 24,874 |
| Total post-secondary schools | n/a | 102 | 7,963 |
| Index | Cardiff | Alabama | National |
| Completed 8th grade | 29.2% | 80.7% | 84.3% |
| Completed high school | 29.2% | 79.2% | 83.0% |
| Completed some college | 25.0% | 53.8% | 59.4% |
| Completed associate degree | 8.3% | 31.9% | 38.5% |
| Completed bachelors | 8.3% | 24.0% | 30.3% |
| Completed masters | 4.2% | 8.9% | 11.5% |
| Completed professional degree | 0.0% | 2.5% | 3.3% |
| Completed doctorate | 0.0% | 1.0% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in Cardiff. Using the proficiency score averages, the average test scores for Cardiff, AL schools is n/a. The average student to teacher ratio is n/a. In Cardiff, AL, an average of 29.2% of students have completed 8th grade and an average of 29.2% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Mountain Brook, AL | 20,178 | 86% | 79.5% |
| Vestavia Hills, AL | 34,482 | 81% | 69.0% |
| Homewood, AL | 25,170 | 71% | 48.8% |
| Mount Olive, AL | 4,052 | 57% | 18.8% |
| Kimberly, AL | 3,551 | 52% | 8.9% |
| Cardiff, AL | 46 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Paynes Creek, CA | 47 | 50% | 4.2% |
| Interior, SD | 47 | 50% | 4.2% |
| Hamer, ID | 45 | 50% | 4.2% |
| Seven Springs, NC | 44 | 35% | 27.6% |
| Crestone, CO | 44 | 18% | 63.5% |
| Cardiff, AL | 46 | n/a |
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