As of the census of 2000, there were 30,870 people, 11,379 households, and 8,147 families residing in the CDP. The population density was 2,996.1 people per square mile (1,157.2/km²). There were 11,900 housing units at an average density of 1,155.0/sq mi (446.1/km²). The racial makeup of the CDP was 23.18% White, 72.11% African American, 0.20% Native American, 2.21% Asian, 0.02% Pacific Islander, 0.54% from other races, and 1.74% from two or more races. Hispanic or Latino of any race were 1.54% of the population.
There were 11,379 households out of which 34.3% had children under the age of 18 living with them, 50.0% were married couples living together, 17.6% had a female householder with no husband present, and 28.4% were non-families. 23.8% of all households were made up of individuals and 7.4% had someone living alone who was 65 years of age or older. The average household size was 2.65 and the average family size was 3.13.
In the CDP the population was spread out with 26.3% under the age of 18, 7.0% from 18 to 24, 30.2% from 25 to 44, 24.8% from 45 to 64, and 11.6% who were 65 years of age or older. The median age was 37 years. For every 100 females there were 84.1 males. For every 100 females age 18 and over, there were 79.0 males.
The median income for a household in the CDP was $58,686, and the median income for a family was $66,089. Males had a median income of $39,455 versus $36,020 for females. The per capita income for the CDP was $24,059. About 4.2% of families and 5.5% of the population were below the poverty line, including 5.9% of those under age 18 and 5.3% of those age 65 or over.
The main road that runs through Randallstown is Maryland Route 26, better known as Liberty Road. This major state highway, which starts as Liberty Heights Avenue in Baltimore City and continues into other Maryland counties, holds most of Randallstown's commercial development.
Old Court Road is one of Randallstown's main cross-county roads, with access to nearby Pikesville and Woodstock. Mostly lined with residential development, the most notable landmark is Northwest Hospital.
McDonogh Road is Randallstown's other major cross-county road, bringing motorists to nearby Owings Mills. Beginning as a two-lane road at Liberty, the road widens after passing Winands Road and soon splits off with Painters Mill Road. Nearby the two-lane section is the parallel Brenbrook Drive to Liberty Road, which eventually merges into McDonogh. After passing Liberty Road, McDonogh turns into Greens Lane which ends at Old Court Road which Greens Lane continues to homes and a dead-end street.
Courtleigh is a road for most motorists on Old Court and Liberty Road that goes through the Randallstown areas and nearby Rockdale. The road travels from Allenswood Road to Lages Lane, then the road changes to Mayfield Avenue and ends at Windsor Mill Road.
A street for most motorists on Windsor Mill Road as a easier exit or a short cut for people around Rolling Road and McDonogh Road area. The road starts at Northwest Hospital, most motorists is around the hospital, schools, the road ends at Mayfield Avenue (by making a left turn - Liberty Road, and right turn to Windsor Mill Road).
Brenbrook Drive is a road that runs parallel to McDonogh Road in the Randallstown area. The road starts at a Y-split off with McDonogh Road near Winands Road, has several 4-way stops, and a traffic circle at the intersection of Church Lane that was installed in 2007. The extension plan is finished, the road currently ends at Old Court Road.
The road starts at Old Court Road in Randallstown, Maryland and across from it is Downey Dale Drive. The road travels pass homes, and a school around the area and ends at Offutt Road, the road does continue but end as a dead-end street.
Offutt Road is a two-lane road that runs from to Granite, Maryland to Randallstown. It starts at Winands Road, where Randallstown High School is located, passes Liberty Road, and then continues on to Granite Road.
Marriotsville Road is a road nearly 11 miles in length that starts as a side street at Lyons Mill Road in Owings Mills, passes through in Randallstown, then continues through Baltimore, Carroll, and Howard Counties to its end at MD-144 near Ellicott City. The wood is mostly surrounded by woods, including Patapsco Valley State Park. Marriottsville Road is also exit 83 off Interstate 70.
Winands Road is a mostly residential two-lane road that runs parallel to Liberty from Old Court Road to Deer Park Road that is used for thru traffic. Notable landmarks include a few public schools and the towers of WBAL radio.
While Randallstown was at one time the planned terminus for the Baltimore Metro Subway [1], the line was ultimately built to nearby Owings Mills. Though no stops on the line are actually in Randallstown, the three stops in Baltimore Country are all within a close drive of the Randallstown area.
Bus service in Randallstown is available on the Maryland Transit Administration's bus routes 54 and 77.