| Index | Lewis | Wisconsin | National |
| Average Test Scores | n/a | 41% | 48% |
| Student/Teacher ratio | n/a | 14:1 | 16:1 |
| Total public schools | n/a | 1,869 | 79,221 |
| Total private schools | n/a | 872 | 24,874 |
| Total post-secondary schools | n/a | 114 | 7,963 |
| Index | Lewis | Wisconsin | National |
| Completed 8th grade | 69.1% | 89.0% | 84.3% |
| Completed high school | 69.1% | 87.8% | 83.0% |
| Completed some college | 34.6% | 59.7% | 59.4% |
| Completed associate degree | 18.5% | 38.7% | 38.5% |
| Completed bachelors | 11.1% | 28.4% | 30.3% |
| Completed masters | 2.5% | 9.6% | 11.5% |
| Completed professional degree | 0.0% | 2.7% | 3.3% |
| Completed doctorate | 0.0% | 1.1% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in Lewis. Using the proficiency score averages, the average test scores for Lewis, WI schools is n/a. The average student to teacher ratio is n/a. In Lewis, WI, an average of 69.1% of students have completed 8th grade and an average of 69.1% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Webster, WI | 660 | 36% | 25.3% |
| Grantsburg, WI | 1,279 | 35% | 27.3% |
| Frederic, WI | 1,171 | 35% | 28.1% |
| Luck, WI | 1,170 | 28% | 41.1% |
| Siren, WI | 777 | 25% | 49.0% |
| Lewis, WI | 146 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Downsville, LA | 146 | 69% | 43.8% |
| Crossnore, NC | 146 | 33% | 30.7% |
| Chinese Camp, CA | 146 | 60% | 25.0% |
| Cloverdale, OR | 146 | 42% | 12.5% |
| Orrville, AL | 145 | 23% | 51.6% |
| Lewis, WI | 146 | n/a |
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