| Place Name | Onslow |
| Place Type | City |
| ZIP Code(s) | 52321 |
| County | Jones County |
| Area Code(s) | 563 |
| Timezone | Central Daylight Time (CDT) |
| Population (2022) | 207 |
| Population Growth Rate (2010-19) | 2.03% |
| Majority Ethnicity | White 90.66% |
| Metro/Micro Stats Area | Cedar Rapids, IA |
| US Congressional District(s) | Iowa 1st |
| State House Districts | 58 |
| State Senate Districts | 29 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 90.66% |
| African American | 5.88% |
| Hispanic | 1.38% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 2.08% |