|• Total||1.7 sq mi (4.3 km2)|
|• Density||2,200/sq mi (840/km2)|
|Time zone||UTC-5 (Eastern (EST))|
|• Summer (DST)||UTC-4 (EDT)|
According to the United States Census Bureau, the CDP has a total area of 1.7 square miles (4.4 km2), of which 0.60% is water.
As of the census of 2000, there were 3,580 people, 801 households, and 550 families residing in the CDP. The population density was 2,155.3 people per square mile (832.7/km²). There were 830 housing units at an average density of 499.7/sq mi (193.1/km²). The racial makeup of the CDP was 96.54% White, 1.37% African American, 0.03% Native American, 0.70% Asian, 0.03% Pacific Islander, 0.56% from other races, and 0.78% from two or more races. Hispanic or Latino of any race were 2.21% of the population.
There were 801 households out of which 29.0% had children under the age of 18 living with them, 57.8% were married couples living together, 8.0% had a female householder with no husband present, and 31.3% were non-families. 20.5% of all households were made up of individuals and 10.6% had someone living alone who was 65 years of age or older. The average household size was 2.55 and the average family size was 2.85.
In the CDP, the population was spread out with 12.3% under the age of 18, 46.8% from 18 to 24, 12.7% from 25 to 44, 15.3% from 45 to 64, and 13.0% who were 65 years of age or older. The median age was 21 years. For every 100 females, there were 77.3 males. For every 100 females age 18 and over, there were 75.3 males.
The median income for a household in the CDP was $57,039, and the median income for a family was $77,216. Males had a median income of $60,292 versus $29,250 for females. The per capita income for the CDP was $28,703. About 4.7% of families and 12.7% of the population were below the poverty line, including 15.4% of those under age 18 and 1.7% of those age 65 or over.
- "Race, Hispanic or Latino, Age, and Housing Occupancy: 2010 Census Redistricting Data (Public Law 94-171) Summary File (QT-PL), Grantley CDP, Pennsylvania". U.S. Census Bureau, American FactFinder 2. Archived from the original on September 11, 2013. Retrieved October 17, 2011.
- "US Gazetteer files: 2010, 2000, and 1990". United States Census Bureau. 2011-02-12. Retrieved 2011-04-23.
- "American FactFinder". United States Census Bureau. Archived from the original on 2013-09-11. Retrieved 2008-01-31.