| Place Name | Keymar |
| Place Type | Unincorporated |
| ZIP Code(s) | 21757 |
| County | Carroll County |
| Area Code(s) | 410,443,667 |
| Timezone | Eastern Daylight Time (EDT) |
| Population () | |
| Metro/Micro Stats Area | Baltimore-Columbia-Towson, MD |
| US Congressional District(s) | Maryland 2nd |
| House of Delegates Districts | 05 |
| State Senate Districts | 05 |