40.8% of the population for whom poverty status is determined in Greendale, MO (321 out of 787 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 Males < 5 and then Females < 5.

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

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.