2020 census The
2020 United States census counted 322 people, 132 households, and 79 families in Grainfield. The racial makeup was 90.06% (290)
white or
European American (89.13%
non-Hispanic white), 0.0% (0)
black or
African-American, 0.0% (0)
Native American or
Alaska Native, 0.0% (0)
Asian, 0.0% (0)
Pacific Islander or
Native Hawaiian, 0.93% (3) from
other races, and 9.01% (29) from
two or more races.
Hispanic or
Latino of any race was 3.11% (10) of the population. Of the 132 households, 25.8% had children under the age of 18; 52.3% were married couples living together; 22.0% had a female householder with no spouse or partner present. 36.4% of households consisted of individuals and 19.7% had someone living alone who was 65 years of age or older. The percent of those with a bachelor’s degree or higher was estimated to be 11.8% of the population. 25.5% of the population was under the age of 18, 5.0% from 18 to 24, 22.0% from 25 to 44, 27.6% from 45 to 64, and 19.9% who were 65 years of age or older. The median age was 43.5 years. For every 100 females, there were 91.7 males. Males had a median income of $27,411 (+/- $14,275) versus $23,906 (+/- $9,567) for females. The median income for those above 16 years old was $26,786 (+/- $8,324). Approximately, 5.5% of families and 6.5% of the population were below the
poverty line, including 0.0% of those under the age of 18 and 17.6% of those ages 65 or over.
2010 census As of the
census of 2010, there were 277 people, 127 households, and 84 families residing in the city. The
population density was . There were 162 housing units at an average density of . The racial makeup of the city was 100.0%
White. There were 127 households, of which 23.6% had children under the age of 18 living with them, 55.9% were
married couples living together, 6.3% had a female householder with no husband present, 3.9% had a male householder with no wife present, and 33.9% were non-families. 33.1% of all households were made up of individuals, and 15.8% had someone living alone who was 65 years of age or older. The average household size was 2.18 and the average family size was 2.71. The median age in the city was 46.2 years. 20.9% of residents were under the age of 18; 7.2% were between the ages of 18 and 24; 20.9% were from 25 to 44; 28.9% were from 45 to 64; and 22% were 65 years of age or older. The gender makeup of the city was 47.3% male and 52.7% female. ==Education==