| Place Name | Mattawa |
| Place Type | City |
| ZIP Code(s) | 99349 |
| County | Grant County |
| Area Code(s) | 509 |
| Timezone | Pacific Standard Time (PST) |
| Population (2022) | 4,361 |
| Population Growth Rate (2010-19) | -24.84% |
| Majority Ethnicity | Hispanic 1.26% |
| Metro/Micro Stats Area | Moses Lake, WA |
| US Congressional District(s) | Washington 4th |
| State House Districts | 13 |
| State Senate Districts | 13 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 16.67% |
| African American | 0% |
| Hispanic | 1.26% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 82.07% |