| Index | Plainfield | New Jersey | National |
| Average Test Scores | 25% | 52% | 48% |
| Student/Teacher ratio | 12:1 | 13:1 | 16:1 |
| Total public schools | 14 | 1,604 | 79,221 |
| Total private schools | 11 | 823 | 24,874 |
| Total post-secondary schools | 3 | 157 | 7,963 |
| Index | Plainfield | New Jersey | National |
| Completed 8th grade | 72.3% | 87.5% | 84.3% |
| Completed high school | 70.3% | 86.3% | 83.0% |
| Completed some college | 39.7% | 60.7% | 59.4% |
| Completed associate degree | 23.3% | 43.9% | 38.5% |
| Completed bachelors | 18.1% | 37.5% | 30.3% |
| Completed masters | 7.0% | 14.4% | 11.5% |
| Completed professional degree | 1.7% | 4.0% | 3.3% |
| Completed doctorate | 0.8% | 1.5% | 1.3% |
There are a total of 14 public schools, 11 private schools and 3 post-secondary schools in Plainfield. Using the proficiency score averages, the average test scores for Plainfield, NJ schools is 25%. The average student to teacher ratio is 12:1. In Plainfield, NJ, an average of 72.3% of students have completed 8th grade and an average of 70.3% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Essex Fells, NJ | 2,037 | 85% | 76.0% |
| Short Hills, NJ | 13,700 | 83% | 73.8% |
| Summit, NJ | 21,913 | 81% | 69.3% |
| Bradley Gardens, NJ | 14,714 | 81% | 68.2% |
| New Providence, NJ | 13,382 | 80% | 66.4% |
| Plainfield, NJ | 50,252 | 25% | 47.5% |
| City | Population | Avg. Test Scores | National Avg. |
| Galveston, TX | 50,307 | 42% | 12.7% |
| Stillwater, OK | 50,183 | 49% | 2.9% |
| Maricopa, AZ | 50,358 | 44% | 8.2% |
| Aliso Viejo, CA | 50,385 | 66% | 37.5% |
| Enid, OK | 50,116 | 39% | 19.6% |
| Plainfield, NJ | 50,252 | 25% | 47.5% |
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