| Index | Custer | South Dakota | National |
| Average Test Scores | 30% | 43% | 49% |
| Student/Teacher ratio | 12:1 | 14:1 | 16:1 |
| Total public schools | 6 | 340 | 79,221 |
| Total private schools | n/a | 76 | 24,874 |
| Total post-secondary schools | n/a | 25 | 7,963 |
| Index | Custer | South Dakota | National |
| Completed 8th grade | 89.6% | 89.1% | 84.3% |
| Completed high school | 86.1% | 86.8% | 83.0% |
| Completed some college | 59.5% | 60.4% | 59.4% |
| Completed associate degree | 33.6% | 38.5% | 38.5% |
| Completed bachelors | 22.9% | 27.5% | 30.3% |
| Completed masters | 4.2% | 8.1% | 11.5% |
| Completed professional degree | 0.9% | 2.5% | 3.3% |
| Completed doctorate | 0.8% | 1.2% | 1.3% |
There are a total of 6 public schools, n/a private schools and n/a post-secondary schools in Custer. Using the proficiency score averages, the average test scores for Custer, SD schools is 30%. The average student to teacher ratio is 12:1. In Custer, SD, an average of 89.6% of students have completed 8th grade and an average of 86.1% have completed high school.
To customize your list of Custer schools, you can start by sorting the list of schools by proficiency test score, school name or student to teacher ratio. Then you can select the grade levels that you would like to see, these include preschool, elementary, middle school and high school. Next, select the school type from the following options: charter, magnet, title I and title 1. Finally, you are able to filter your results by average proficiency score. Simply select the minimum proficiency score that you would like to see and only schools with that proficiency score or higher will appear on your list of Custer, SD schools.
| City, State | Population | Avg. Test Scores | National Avg. |
| Hill City, SD | 1,358 | 50% | 2% |
| Custer, SD | 1,770 | 30% | 40% |
| City, State | Population | Avg. Test Scores | National Avg. |
| Elizabethville, PA | 1,770 | 72% | 46% |
| Neoga, IL | 1,770 | 28% | 42% |
| Forreston, IL | 1,771 | 37% | 24% |
| West Baraboo, WI | 1,771 | 55% | 11% |
| Landisville, PA | 1,769 | 69% | 41% |
| Custer, SD | 1,770 | 30% | 40% |