2020 census As of the
2020 census, Poplar Grove had a population of 5,049 people, 1,709 households, and 1,310 families. The median age was 37.0 years. 29.3% of residents were under the age of 18 and 13.3% of residents were 65 years of age or older. For every 100 females there were 98.2 males, and for every 100 females age 18 and over there were 96.6 males age 18 and over. The population density was . There were 1,787 housing units at an average density of . 15.1% of residents lived in urban areas, while 84.9% lived in rural areas. Of the 1,787 housing units, 4.4% were vacant. The homeowner vacancy rate was 1.7% and the rental vacancy rate was 6.1%.
Income and poverty The median income for a household in the village was $74,896, and the median income for a family was $79,115. Males had a median income of $65,208 versus $33,750 for females. The
per capita income for the village was $38,756. About 5.3% of families and 5.5% of the population were below the
poverty line, including 10.0% of those under age 18 and 0.0% of those age 65 or over. ==Education==