The northern regions of Baltimore County are primarily rural, featuring a "Piedmont Plateau" landscape of rolling hills and deciduous forests. The southern and south-central regions of the county are primarily suburban in character.
As of the census of 2000, there were 754,292 people, 299,877 households, and 198,518 families residing in the county. The population density was 1,260 people per square mile (487/km²). There were 313,734 housing units at an average density of 524 per square mile (202/km²). The racial makeup of the county was 74.39% White, 20.10% Black or African American, 0.25% Native American, 3.17% Asian, 0.03% Pacific Islander, 0.62% from other races, and 1.43% from two or more races. 1.83% of the population were Hispanic or Latino of any race. 18.4% were of German, 10.8% Irish, 7.3% English, 7.0% Italian, 6.1% United States or American and 5.4% Polish ancestry according to Census 2000. There is also a large Jewish population that migrated from Park Heights into the communities of Pikesville, Owings Mills and Reisterstown, referred to by Jewish residents as "100,000 Jews in three zip codes".
There were 299,877 households out of which 30.20% had children under the age of 18 living with them, 49.40% were married couples living together, 12.80% had a female householder with no husband present, and 33.80% were non-families. 27.30% of all households were made up of individuals and 10.10% had someone living alone who was 65 years of age or older. The average household size was 2.46 and the average family size was 3.00.
In the county the population was spread out with 23.60% under the age of 18, 8.50% from 18 to 24, 29.80% from 25 to 44, 23.40% from 45 to 64, and 14.60% who were 65 years of age or older. The median age was 38 years. For every 100 females there were 90.00 males. For every 100 females age 18 and over, there were 86.00 males.
The median income for a household in the county was $50,667, and the median income for a family was $59,998. Males had a median income of $41,048 versus $31,426 for females. The per capita income for the county was $26,167. About 4.50% of families and 6.50% of the population were below the poverty line, including 7.20% of those under age 18 and 6.50% of those age 65 or over.
The following is a population history for Baltimore County[2]. The ranking compares the population of Baltimore County to those of the other 23 Maryland counties and Baltimore City.
Of note:
Several major interstate highways run through the county, including I-95, I-83, I-195, I-795 and I-70; the latter has its eastern terminus in the county. The majority of the McKeldin Beltway, I-695, is contained within the county as well.
The Maryland Transit Administration (MTA) operates two rail systems -- one light rail and one rapid transit -- in the Baltimore area; both systems have stations in Baltimore County. The heavy-rail Metro Subway runs northwest of the city to Owings Mills; the Light Rail system runs north of the city to Hunt Valley and south of the city through Baltimore Highlands. The MTA also operates its bus service into the county, providing links to communities within the county and surrounding areas.
Both CSX Transportation and Amtrak mainlines run through the county. Former rail lines, now abandoned, were the Maryland and Pennsylvania Railroad and the Northern Central Railway (part of the old Pennsylvania Railroad).