2020 census As of the
2020 census, the county had a population of 390,357, and the median age was 37.4 years. 23.4% of residents were under the age of 18 and 15.4% of residents were 65 years of age or older. For every 100 females there were 97.0 males, and for every 100 females age 18 and over there were 94.8 males age 18 and over. The racial makeup of the county was 76.6%
White, 8.9%
Black or African American, 0.4%
American Indian and Alaska Native, 4.0%
Asian, 0.1%
Native Hawaiian and
Pacific Islander, 3.5% from some other race, and 6.5% from
two or more races.
Hispanic or Latino residents of any race comprised 6.5% of the population. 90.4% of residents lived in urban areas, while 9.6% lived in rural areas. There were 145,159 households in the county, of which 32.3% had children under the age of 18 living in them. Of all households, 49.3% were married-couple households, 17.9% were households with a male householder and no spouse or partner present, and 25.5% were households with a female householder and no spouse or partner present. About 25.1% of all households were made up of individuals and 10.0% had someone living alone who was 65 years of age or older. The population density was . There were 148,273 housing units at an average density of . The racial makeup of the county was 86.0% white, 7.3% black or African American, 2.4% Asian, 0.2% American Indian, 0.1% Pacific islander, 1.8% from other races, and 2.1% from two or more races. Those of Hispanic or Latino origin made up 4.0% of the population. Of the 135,960 households, 35.9% had children under the age of 18 living with them, 52.9% were married couples living together, 12.4% had a female householder with no husband present, 29.8% were non-families, and 23.5% of all households were made up of individuals. The average household size was 2.63 and the average family size was 3.10. The median age was 36.0 years.
2000 census As of the
census of 2000, there were 332,807 people, 123,082 households, and 87,880 families residing in the county. The population density was . There were 129,793 housing units at an average density of . The racial makeup of the county was 91.20%
White, 5.27%
Black or
African American, 0.21%
Native American, 1.55%
Asian, 0.03%
Pacific Islander, 0.62% from
other races, and 1.13% from two or more races. 1.43% of the population were
Hispanic or
Latino of any race. 28.1% were of
German, 16.7%
American, 10.7%
Irish, and 9.8%
English ancestry according to
Census 2000. Those citing "
American" ancestry in Butler County are of overwhelmingly English extraction, most
English Americans identify simply as American because their ancestors have been in North America for centuriesin some cases since the 1600s. There were 123,082 households, out of which 35.50% had children under the age of 18 living with them, 57.00% were
married couples living together, 10.70% had a female householder with no husband present, and 28.60% were non-families. 22.70% of all households were made up of individuals, and 7.60% 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 3.07. In the county, the population was spread out, with 25.90% under the age of 18, 11.90% from 18 to 24, 29.80% from 25 to 44, 21.70% from 45 to 64, and 10.70% who were 65 years of age or older. The median age was 34 years. For every 100 females there were 95.30 males. For every 100 females age 18 and over, there were 92.20 males. The median income for a household in the county was $47,885, and the median income for a family was $57,513. Males had a median income of $42,052 versus $27,602 for females. The
per capita income for the county was $22,076. About 5.40% of families and 8.70% of the population were below the
poverty line, including 9.10% of those under age 18 and 7.00% of those age 65 or over. ==Politics==