Carney is located at 39°23′48″N 76°31′27″W (39.396707, -76.524078).
According to the United States Census Bureau, the CDP has a total area of 7.0 square miles (18 km2), all of it land.
As of the census of 2000, there were 28,264 people, 12,083 households, and 7,322 families residing in the CDP. The population density was 4,042.7 people per square mile (1,561.2/km²). There were 12,477 housing units at an average density of 1,784.6 per square mile (689.2/km²). The racial makeup of the CDP was 85.31% White, 6.92% African American, 0.17% Native American, 5.74% Asian, 0.06% Pacific Islander, 0.43% from other races, and 1.37% from two or more races. Hispanic or Latino of any race were 1.51% of the population.
There were 12,083 households out of which 27.1% had children under the age of 18 living with them, 46.2% were married couples living together, 10.6% had a female householder with no husband present, and 39.4% were non-families. 32.4% of all households were made up of individuals and 15.0% had someone living alone who was 65 years of age or older. The average household size was 2.28 and the average family size was 2.91.
In the CDP, the population was spread out with 22.0% under the age of 18, 8.2% from 18 to 24, 29.4% from 25 to 44, 21.0% from 45 to 64, and 19.4% who were 65 years of age or older. The median age was 39 years. For every 100 females there were 89.5 males. For every 100 females age 18 and over, there were 84.3 males.
The median income for a household in the CDP was $49,365, and the median income for a family was $57,079. Males had a median income of $40,265 versus $31,914 for females. The per capita income for the CDP was $24,428. About 2.8% of families and 5.4% of the population were below the poverty line, including 5.2% of those under age 18 and 7.5% of those age 65 or over.
In 1880, Thomas Carney immigrated to the United States from Ireland and settled in Texas, Maryland. Soon after his arrival, he married the former Mary McDermot and bought forty and a half acres on the southeast side of the Baltimore and Harford Turnpike.
Several years later (about 1885), the Carney family moved to what is now Harford and Joppa roads, where Thomas Carney opened a general store which is believed to have served as the Eight Mile House on the turnpike. The store was located on the site presently occupied by the Barn Restaurant. In the 1880s and 1890s the store also served as the Carney family home.
When the family grew too large for the store, Mr. Carney built a new house on the hill behind the store. The house was completed in about 1898 and stood in the vicinity of what is now Thornewood Court. Thirty-five years later, the Carney house was moved to its present location at the corner of Joppa and Avondale roads and is now a real estate office.
With the passage of time and the suburban growth of Baltimore County, the land once owned by the Carney family has been sold to individuals and developers. However, the Carney family name is now carried by area businesses and clubs. Two institutions, the Carney Library and the Carney Elementary School, also carry the name. Little did Thomas Carney, an industrious Irish immigrant, realize that his memory would live on by a community which bears his name.
Carney is served by Carney Elementary School, Harford Hills Elementary School,and Pine Grove Elementary School, Pine Grove Middle School, Loch Raven High School, and Parkville High School
Some of the major roads in the Carney area are:Joppa Road
Harford Road (MD-147)
Old Harford Road
The Maryland Transit Administration's Bus Route 19 operates along Harford Road between the Carney Park-and-Ride and Downtown Baltimore.