| Place Name | Koontz Lake |
| Place Type | Census Designated Place |
| ZIP Code(s) | 46574 |
| County | Starke County Marshall County |
| Area Code(s) | 574 |
| Timezone | (UTC) |
| Population (2022) | 1,525 |
| Population Growth Rate (2010-19) | 7.06% |
| Majority Ethnicity | White 99% |
| Metro/Micro Stats Area | Plymouth, IN |
| US Congressional District(s) | Indiana 2nd |
| State House Districts | 17,20 |
| State Senate Districts | 8,9 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 99% |
| African American | 0% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 1% |