| Place Name | Mercer |
| Place Type | Census Designated Place |
| ZIP Code(s) | 54547 |
| County | Iron County |
| Area Code(s) | 535,715 |
| Timezone | Central Daylight Time (CDT) |
| Population (2022) | 467 |
| Population Growth Rate (2010-19) | 6.78% |
| Majority Ethnicity | White 93.26% |
| US Congressional District(s) | Wisconsin 7th |
| State Assembly Districts | 74 |
| State Senate Districts | 25 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 93.26% |
| African American | 0% |
| Hispanic | 1.47% |
| Asian | 0.84% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 4.42% |