| Place Name | Waltham Township |
| Place Type | Township |
| ZIP Code(s) | 61301 61350 61373 |
| County | LaSalle County |
| Area Code(s) | 815,779 |
| Timezone | Central Daylight Time (CDT) |
| Population (2021) | 662 |
| Majority Ethnicity | White 99.25% |
| Metro/Micro Stats Area | Ottawa, IL |
| US Congressional District(s) | Illinois 16th |
| State House Districts | 76 |
| State Senate Districts | 38 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 99.25% |
| African American | 0% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 0.75% |