Howard County is a county in the central part of the U.S. state of Maryland. As of the 2010 census, the population was 287,085. Its county seat is Ellicott City.
According to the U.S. Census Bureau, the county has a total area of 253 square miles (660 km), of which 251 square miles (650 km) is land and 2.7 square miles (7.0 km) (1.0%) is water. It is the second-smallest county in Maryland by land area and smallest by total area.
Howard County is located in the Piedmont Plateau region of Maryland, with rolling hills making up most of the landscape. It is bounded on the north and northeast by the Patapsco River, on the southwest by the Patuxent River, and on the southeast by a land border with Anne Arundel County. Both the Patapsco and Patuxent run largely through publicly accessible parkland along the county borders. The Patuxent border includes the Triadelphia and Rocky Gorge reservoirs.
As of the census of 2000, there were 247,842 people, 90,043 households, and 65,821 families residing in the county. The population density was 983 people per square mile (380/km). There were 92,818 housing units at an average density of 368 per square mile (142/km). The racial makeup of the county was 74.33% White, 14.42% Black, 0.24% Native American, 7.68% Asian, 0.04% Pacific Islander, 1.11% from other races, and 2.19% from two or more races. 3.02% of the population were Hispanic or Latino of any race. 15.1% were of German, 11.0% Irish, 9.3% English, 6.6% Italian and 5.7% American ancestry.
There were 90,043 households out of which 40.00% had children under the age of 18 living with them, 60.50% were married couples living together, 9.50% had a female householder with no husband present, and 26.90% were non-families. 20.80% of all households were made up of individuals, and 4.60% had someone living alone who was 65 years of age or older. The average household size was 2.71, and the average family size was 3.18.
In the county, the population was spread out with 28.10% under the age of 18, 6.30% from 18 to 24, 34.40% from 25 to 44, 23.80% from 45 to 64, and 7.50% who were 65 years of age or older. The median age was 36 years. For every 100 females, there were 96.60 males. For every 100 females age 18 and over, there were 92.90 males.
The median income for a household in the county was $101,003, and the median income for a family was $117,186 in 2009. The per capita income was $44,120. About 2.70% of families and 4.00% of the population were below the poverty line.
As of the 2010 United States Census, there were 287,085 people, 104,749 households, and 76,333 families residing in the county. The population density was 1,144.9 inhabitants per square mile (442.0/km). There were 109,282 housing units at an average density of 435.8 per square mile (168.3/km). The racial makeup of the county was 62.2% white, 17.5% Black or African American, 14.4% Asian, 0.3% American Indian, 2.0% from other races, and 3.6% from two or more races. Those of Hispanic or Latino origin made up 5.8% of the population. In terms of ancestry, 17.7% were German, 13.9% were Irish, 10.6% were English, 7.0% were Italian, and 4.6% were American.
Of the 104,749 households, 39.3% had children under the age of 18 living with them, 58.9% were married couples living together, 10.5% had a female householder with no husband present, 27.1% were non-families, and 21.9% of all households were made up of individuals. The average household size was 2.72, and the average family size was 3.20. The median age was 38.4 years.
The median income for a household in the county was $103,273, and the median income for a family was $119,810. Males had a median income of $82,307 versus $59,128 for females. The per capita income for the county was $45,294. About 2.8% of families and 4.2% of the population were below the poverty line, including 4.6% of those under age 18 and 5.5% of those age 65 or over.