13.8% of the population for whom poverty status is determined in Martinsburg, MO (72 out of 522 people) live below the poverty line, a number that is higher than the national average of 12.5%. The largest demographic living in poverty are Males 65 - 74, followed by Females 65 - 74 and then Females 55 - 64.

The most common racial or ethnic group living below the poverty line in Martinsburg, MO is White, followed by Black and Native American.

The Census Bureau uses a set of money income thresholds that vary by family size and composition to determine who classifies as impoverished. If a family's total income is less than the family's threshold than that family and every individual in it is considered to be living in poverty.