2020 census
As of the 2020 census, the county had a population of 17,958. The median age was 41.4 years. 23.1% of residents were under the age of 18 and 18.3% of residents were 65 years of age or older. For every 100 females there were 98.3 males, and for every 100 females age 18 and over there were 96.7 males age 18 and over.[13][14]
The racial makeup of the county was 90.8% White, 2.6% Black or African American, 0.5% American Indian and Alaska Native, 0.4% Asian, <0.1% Native Hawaiian and Pacific Islander, 1.0% from some other race, and 4.8% from two or more races. Hispanic or Latino residents of any race comprised 2.5% of the population.[14]
26.2% of residents lived in urban areas, while 73.8% lived in rural areas.[15]
There were 7,091 households in the county, of which 32.1% had children under the age of 18 living in them. Of all households, 54.9% were married-couple households, 17.4% were households with a male householder and no spouse or partner present, and 22.5% were households with a female householder and no spouse or partner present. About 24.8% of all households were made up of individuals and 11.7% had someone living alone who was 65 years of age or older.[13]
There were 7,839 housing units, of which 9.5% were vacant. Among occupied housing units, 78.3% were owner-occupied and 21.7% were renter-occupied. The homeowner vacancy rate was 1.3% and the rental vacancy rate was 8.9%.[13]
2000 census
As of the 2000 census,[16] there were 16,464 people, 4,241 households, and 4,780 families residing in the county. The population density was 26 inhabitants per square mile (10/km2). There were 6,960 housing units at an average density of 11 per square mile (4.2/km2). The racial makeup of the county was 95.55% White, 2.47% Black or African American, 0.45% Native American, 0.13% Asian, 0.03% Pacific Islander, 0.64% from other races, and 0.73% from two or more races. 1.15% of the population were Hispanic or Latino of any race.
There were 6,241 households, out of which 35.60% had children under the age of 18 living with them, 64.70% were married couples living together, 8.50% had a female householder with no husband present, and 23.40% were non-families. 20.40% of all households were made up of individuals, and 9.00% had someone living alone who was 65 years of age or older. The average household size was 2.61 and the average family size was 3.00.
In the county, the population was spread out, with 25.90% under the age of 18, 8.00% from 18 to 24, 29.60% from 25 to 44, 24.30% from 45 to 64, and 12.20% who were 65 years of age or older. The median age was 37 years. For every 100 females, there were 98.50 males. For every 100 females age 18 and over, there were 96.30 males.
The median income for a household in the county was $37,182, and the median income for a family was $42,901. Males had a median income of $31,842 versus $22,098 for females. The per capita income for the county was $17,547. About 7.80% of families and 10.20% of the population were below the poverty line, including 12.50% of those under age 18 and 13.00% of those age 65 or over.
The largest self-identified ancestry groups in Grant County, Arkansas are:[17]
- 30.1% English
- 12.0% American
- 9.5% Irish
- 8.9% German
- 1.4% Italian
- 1.2% Polish
- 1.1% French
- 0.7% Swedish
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