| Index | South Plainfield | New Jersey | National |
| Average Test Scores | 61% | 52% | 48% |
| Student/Teacher ratio | 13:1 | 13:1 | 16:1 |
| Total public schools | 8 | 1,604 | 79,221 |
| Total private schools | 4 | 823 | 24,874 |
| Total post-secondary schools | 5 | 157 | 7,963 |
| Index | South Plainfield | New Jersey | National |
| Completed 8th grade | 87.4% | 87.5% | 84.3% |
| Completed high school | 86.2% | 86.3% | 83.0% |
| Completed some college | 58.8% | 60.7% | 59.4% |
| Completed associate degree | 42.4% | 43.9% | 38.5% |
| Completed bachelors | 37.1% | 37.5% | 30.3% |
| Completed masters | 13.7% | 14.4% | 11.5% |
| Completed professional degree | 2.6% | 4.0% | 3.3% |
| Completed doctorate | 1.5% | 1.5% | 1.3% |
There are a total of 8 public schools, 4 private schools and 5 post-secondary schools in South Plainfield. Using the proficiency score averages, the average test scores for South Plainfield, NJ schools is 61%. The average student to teacher ratio is 13:1. In South Plainfield, NJ, an average of 87.4% of students have completed 8th grade and an average of 86.2% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| 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% |
| Chatham, NJ | 8,729 | 79% | 64.9% |
| South Plainfield, NJ | 23,961 | 61% | 27.2% |
| City | Population | Avg. Test Scores | National Avg. |
| Ponca City, OK | 23,940 | 35% | 26.2% |
| Auburn Hills, MI | 23,984 | 33% | 31.5% |
| Kalispell, MT | 23,935 | 49% | 2.1% |
| Freeport, IL | 23,930 | 19% | 60.8% |
| Sugar Hill, GA | 23,994 | 62% | 28.6% |
| South Plainfield, NJ | 23,961 | 61% | 27.2% |
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