| Place Name | Alto |
| Place Type | Census Designated Place |
| ZIP Code(s) | 53919 53963 |
| County | Fond Du Lac County |
| Area Code(s) | 274,920 |
| Timezone | Central Daylight Time (CDT) |
| Population (2022) | 171 |
| Majority Ethnicity | White 95.38% |
| Metro/Micro Stats Area | Fond du Lac, WI |
| US Congressional District(s) | Wisconsin 6th |
| State Assembly Districts | 42 |
| State Senate Districts | 14 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 95.38% |
| African American | 0% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 4.62% |