Martinsburg
- County:
- Audrain County
- County Seat:
- No
- Area (mi²):
- 0.273
- State:
- Missouri
Martinsburg is a town located in Audrain County, Missouri. Martinsburg has a 2026 population of 257. Martinsburg is currently growing at a rate of 0.39% annually and its population has increased by 2.39% since the most recent census, which recorded a population of 251 in 2020.
The median household income in Martinsburg is $34,503 with a poverty rate of 13.79%. The median age in Martinsburg is 39.6 years: 45.7 years for males, and 39.2 years for females. For every 100 females there are 56.3 males.