Dauphin County

2020 census

As of the 2020 census, the county had a population of 286,401. The median age was 39.8 years. 21.6% of residents were under the age of 18 and 17.6% of residents were 65 years of age or older. For every 100 females there were 94.6 males, and for every 100 females age 18 and over there were 92.1 males age 18 and over.

The racial makeup of the county was 63.2% White, 17.8% Black or African American, 0.3% American Indian and Alaska Native, 6.0% Asian, <0.1% Native Hawaiian and Pacific Islander, 5.2% from some other race, and 7.5% from two or more races. Hispanic or Latino residents of any race comprised 10.9% of the population.

85.2% of residents lived in urban areas, while 14.8% lived in rural areas.

There were 116,761 households in the county, of which 27.9% had children under the age of 18 living in them. Of all households, 42.2% were married-couple households, 19.7% were households with a male householder and no spouse or partner present, and 30.5% were households with a female householder and no spouse or partner present. About 31.4% of all households were made up of individuals and 12.3% had someone living alone who was 65 years of age or older.

There were 126,514 housing units, of which 7.7% were vacant. Among occupied housing units, 61.1% were owner-occupied and 38.9% were renter-occupied. The homeowner vacancy rate was 1.4% and the rental vacancy rate was 7.2%.

2010 census

As of the 2010 census, the county was 72.7% White, 18.0% Black or African American, 0.2% Native American, 3.2% Asian, and 3.1% were two or more races. 7.0% of the population were of Hispanic or Latino ancestry.

2000 census

As of the 2000 census, there were 251,798 people, 102,670 households, and 66,119 families residing in the county. The population density was 479 inhabitants per square mile (185/km2). There were 111,133 housing units at an average density of 212 units per square mile (82/km2). The racial makeup of the county was 77.11% White, 16.91% Black or African American, 0.16% Native American, 1.96% Asian, 0.03% Pacific Islander, 1.97% from other races, and 1.85% from two or more races. 4.13% of the population were Hispanic or Latino of any race. 29.2% were of German, 7.5% Irish, 7.3% American and 7.2% Italian ancestry. 91.8% spoke English and 3.9% Spanish as their first language.

In 2000 there were 102,670 households, out of which 29.70% had children under the age of 18 living with them, 47.60% were married couples living together, 12.90% had a female householder with no husband present, and 35.60% were non-families. 30.00% of all households were made up of individuals, and 10.30% had someone living alone who was 65 years of age or older. The average household size was 2.39 and the average family size was 2.98.