It is found within the triangle made by the intersection of three highways: Interstate 495 (the Capital Beltway), Interstate 66, and State Route 267 (the Dulles Toll Road). Within this triangle, the actual bounds of the neighborhood are Lemon Road Creek, State Route 7, and Magarity Road. Although geographically Pimmit Hills is part of Fairfax County, Pimmit Hills addresses use Falls Church as their mailing address.
During the 1970s the area suffered from depressed real estate values and received a bad reputation as hosting rough biker gangs and poorly maintained properties. This began to turn around in the 1990s. Current real estate values mirror the rest of northern Virginia, with extreme value appreciation within the last several years. Like most of the rest of northern Virginia, the ethnic mix in the neighborhood is quite varied.
Several attempts have been made by commercial developers to buy up Pimmit properties and convert them to higher-density housing such as condominiums or town houses, but so far these have been resisted by homeowners. Add-ons to the original houses such as second floors, basements, and same-floor expansions are common.
The trailer park in the NBC sitcom My Name Is Earl is named "Pimmit Hills Trailer Park" after the neighborhood. The series creator, Greg Garcia, lived in Pimmit Hills for a time as a child.
According to the United States Census Bureau, the CDP has a total area of 1.5 square miles (3.8 km²), all of it land.
There were 2,258 households out of which 29.4% had children under the age of 18 living with them, 55.8% were married couples living together, 8.3% had a female householder with no husband present, and 32.2% were non-families. 21.7% of all households were made up of individuals and 6.3% had someone living alone who was 65 years of age or older. The average household size was 2.72 and the average family size was 3.20.
In the CDP the population was spread out with 21.2% under the age of 18, 8.8% from 18 to 24, 36.0% from 25 to 44, 23.5% from 45 to 64, and 10.4% who were 65 years of age or older. The median age was 36 years. For every 100 females there were 102.7 males. For every 100 females age 18 and over, there were 99.9 males.
The median income for a household in the CDP was $63,028, and the median income for a family was $65,216. Males had a median income of $42,402 versus $35,750 for females. The per capita income for the CDP was $28,581. About 2.0% of families and 2.5% of the population were below the poverty line, including 3.4% of those under age 18 and 3.3% of those age 65 or over.