Racial and ethnic composition 2020 census As of the
2020 census, Coal City had a population of 5,705 and 1,297 families. The median age was 38.4 years. 24.1% of residents were under the age of 18 and 15.0% of residents were 65 years of age or older. For every 100 females there were 102.4 males, and for every 100 females age 18 and over there were 98.4 males age 18 and over. There were 2,286 households in Coal City, of which 32.1% had children under the age of 18 living in them. Of all households, 47.6% were married-couple households, 19.4% were households with a male householder and no spouse or partner present, and 24.2% were households with a female householder and no spouse or partner present. About 28.2% of all households were made up of individuals and 11.2% had someone living alone who was 65 years of age or older. There were 2,418 housing units, of which 5.5% were vacant. The homeowner vacancy rate was 1.4% and the rental vacancy rate was 7.3%.
Income and poverty The median income for a household in the village was $75,108, and the median income for a family was $97,695. Males had a median income of $66,654 versus $40,755 for females. The
per capita income for the village was $36,011. About 3.9% of families and 6.1% of the population were below the
poverty line, including 4.1% of those under age 18 and 4.6% of those age 65 or over. ==Education==