| Place Name | Martinsburg |
| Place Type | Town |
| ZIP Code(s) | 65264 |
| County | Audrain County |
| Area Code(s) | 573 |
| Timezone | Central Daylight Time (CDT) |
| Population (2022) | 324 |
| Population Growth Rate (2010-19) | -17.43% |
| Majority Ethnicity | White 96.66% |
| Metro/Micro Stats Area | Mexico, MO |
| US Congressional District(s) | Missouri 4th |
| State House Districts | 43 |
| State Senate Districts | 10 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 96.66% |
| African American | 2.99% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 0.35% |