| Place Name | Arnold |
| Place Type | Census Designated Place |
| ZIP Code(s) | 21012 |
| County | Anne Arundel County |
| Area Code(s) | 410,443,667 |
| Timezone | Eastern Daylight Time (EDT) |
| Population (2022) | 22,626 |
| Population Growth Rate (2010-19) | 4.15% |
| Majority Ethnicity | White 82.51% |
| Metro/Micro Stats Area | Baltimore-Columbia-Towson, MD |
| US Congressional District(s) | Maryland 4th |
| House of Delegates Districts | 33,30A |
| State Senate Districts | 30,33 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 82.51% |
| African American | 5.17% |
| Hispanic | 0.13% |
| Asian | 3.45% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 8.74% |