| Index | Plains | Montana | National |
| Average Test Scores | 46% | 45% | 48% |
| Student/Teacher ratio | 14:1 | 14:1 | 16:1 |
| Total public schools | 4 | 408 | 79,221 |
| Total private schools | n/a | 77 | 24,874 |
| Total post-secondary schools | n/a | 32 | 7,963 |
| Index | Plains | Montana | National |
| Completed 8th grade | 78.0% | 89.4% | 84.3% |
| Completed high school | 74.9% | 88.2% | 83.0% |
| Completed some college | 43.5% | 63.1% | 59.4% |
| Completed associate degree | 22.2% | 38.6% | 38.5% |
| Completed bachelors | 15.8% | 29.9% | 30.3% |
| Completed masters | 4.0% | 9.8% | 11.5% |
| Completed professional degree | 1.2% | 3.0% | 3.3% |
| Completed doctorate | 0.0% | 1.2% | 1.3% |
There are a total of 4 public schools, n/a private schools and n/a post-secondary schools in Plains. Using the proficiency score averages, the average test scores for Plains, MT schools is 46%. The average student to teacher ratio is 14:1. In Plains, MT, an average of 78.0% of students have completed 8th grade and an average of 74.9% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| St. Regis, MT | 207 | 47% | 2.8% |
| Hot Springs, MT | 627 | 30% | 37.5% |
| Plains, MT | 1,019 | 46% | 5.2% |
| City | Population | Avg. Test Scores | National Avg. |
| New Salem, ND | 1,019 | 53% | 10.9% |
| Leroy, AL | 1,019 | 39% | 18.8% |
| Hebron, MD | 1,019 | 47% | 2.1% |
| Cochranton, PA | 1,019 | 57% | 18.8% |
| Cobden, IL | 1,018 | 31% | 34.7% |
| Plains, MT | 1,019 | 46% | 5.2% |
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