12.4% of the population for whom poverty status is determined in Alcester, SD (116 out of 932 people) live below the poverty line, a number that is lower than the national average of 12.5%. The largest demographic living in poverty are Females 65 - 74, followed by Females 55 - 64 and then Females 25 - 34.

The most common racial or ethnic group living below the poverty line in Alcester, SD is White, followed by Native American 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.