2020 census As of the
2020 census, Grayville had a population of 1,550. The median age was 46.4 years. 19.9% of residents were under the age of 18 and 23.1% of residents were 65 years of age or older. For every 100 females there were 94.2 males, and for every 100 females age 18 and over there were 93.0 males age 18 and over. 0.0% of residents lived in urban areas, while 100.0% lived in rural areas. There were 683 households in Grayville, of which 25.9% had children under the age of 18 living in them. Of all households, 42.2% were married-couple households, 22.0% were households with a male householder and no spouse or partner present, and 27.8% were households with a female householder and no spouse or partner present. About 34.1% of all households were made up of individuals and 16.5% had someone living alone who was 65 years of age or older. There were 400 families residing in the city. The population density was . There were 808 housing units at an average density of , of which 15.5% were vacant. The homeowner vacancy rate was 2.7% and the rental vacancy rate was 12.2%.
Income and poverty The median income for a household in the city was $47,222, and the median income for a family was $58,333. Males had a median income of $41,522 versus $22,500 for females. The
per capita income for the city was $24,233. About 14.0% of families and 20.5% of the population were below the
poverty line, including 29.5% of those under age 18 and 18.0% of those age 65 or over. ==Transportation==