| Place Name | Clarksville |
| Place Type | Unincorporated |
| ZIP Code(s) | 21029 |
| County | Howard County |
| Area Code(s) | 410,443,667 |
| Timezone | Eastern Standard Time (EST) |
| Population () | |
| Metro/Micro Stats Area | Baltimore-Columbia-Towson, MD |
| US Congressional District(s) | Maryland 3rd |
| House of Delegates Districts | 09A |
| State Senate Districts | 09 |