18.2% of the population for whom poverty status is determined in Marble City, OK (30 out of 165 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 Females 65 - 74, followed by Females 6 - 11 and then Males 18 - 24.

The most common racial or ethnic group living below the poverty line in Marble City, OK is Native American, followed by White and Hispanic.

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.