| Index | Marcus | Iowa | National |
| Average Test Scores | 76% | 69% | 48% |
| Student/Teacher ratio | 14:1 | 13:1 | 16:1 |
| Total public schools | 2 | 1,101 | 79,221 |
| Total private schools | n/a | 208 | 24,874 |
| Total post-secondary schools | n/a | 96 | 7,963 |
| Index | Marcus | Iowa | National |
| Completed 8th grade | 89.5% | 89.2% | 84.3% |
| Completed high school | 86.9% | 87.7% | 83.0% |
| Completed some college | 54.8% | 59.8% | 59.4% |
| Completed associate degree | 36.2% | 38.4% | 38.5% |
| Completed bachelors | 23.0% | 27.2% | 30.3% |
| Completed masters | 5.2% | 8.7% | 11.5% |
| Completed professional degree | 2.4% | 2.7% | 3.3% |
| Completed doctorate | 0.8% | 1.1% | 1.3% |
There are a total of 2 public schools, n/a private schools and n/a post-secondary schools in Marcus. Using the proficiency score averages, the average test scores for Marcus, IA schools is 76%. The average student to teacher ratio is 14:1. In Marcus, IA, an average of 89.5% of students have completed 8th grade and an average of 86.9% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Orange City, IA | 6,158 | 87% | 81.8% |
| Alton, IA | 1,534 | 81% | 68.8% |
| Paullina, IA | 934 | 75% | 55.2% |
| Remsen, IA | 1,802 | 71% | 47.9% |
| Cherokee, IA | 4,883 | 66% | 37.8% |
| Marcus, IA | 1,295 | 76% | 58.3% |
| City | Population | Avg. Test Scores | National Avg. |
| Harper, KS | 1,295 | 42% | 12.5% |
| Clinton, KY | 1,296 | 53% | 9.9% |
| Tennessee Ridge, TN | 1,296 | 27% | 43.8% |
| Sand Lake, MI | 1,296 | 35% | 28.1% |
| Glenns Ferry, ID | 1,294 | 37% | 22.6% |
| Marcus, IA | 1,295 | 76% | 58.3% |
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