|Elevation||338 ft (103 m)|
|Area||3.4 sq mi (8.8 km2)|
|- land||3.4 sq mi (9 km2)|
|- water||0.0 sq mi (0 km2), 0%|
|Density||1,421.2 / sq mi (548.7 / km2)|
|- summer (DST)||EDT (UTC-4)|
Gilbertsville is a census-designated place (CDP) in northwest Montgomery County, Pennsylvania, United States. It is located in Douglass Township at the junction of Routes 73 and 100. The population was 4,832 at the 2010 census, and the ZIP code is 19525. The name is also applied to an indeterminate adjacent section of New Hanover Township served by the Gilbertsville Post Office, and in fact the New Hanover Township offices are located in an area considered to be part of Gilbertsville. Boyertown School District covers the town of Gilbertsville.
Gilbertsville began when the descendants of William Gilbert, an English astronomer, physician, and physicist, decided to permanently move to America. Although many of the Gilberts fought for America in the Revolutionary War, Abijah Gilbert did not relocate his family until 1790. In the fall of 1789, 1,000 acres (4.0 km2) of land were purchased for the modern-day price of $2000. It was the first land purchased from the Morris Trust in Montgomery County, Pennsylvania. The Gilberts purchased more land in later years. A Gilbert Family letter recalls that as Abijah Gilbert's son, Joseph Thomas Gilbert, was disembarking in Philadelphia, George Washington patted him on the head and said, "A fine, rosy-cheeked English boy, who will make a good American Citizen."
Gilbertsville is located at (40.319150, -75.614103).
According to the United States Census Bureau, the CDP has a total area of 3.4 square miles (8.8 km2), all of it land.
As of the census of 2000, there were 4,242 people, 1,621 households, and 1,209 families residing in the C.D.P. The population density was 1,258.7 people per square mile (486.0/km²). There were 1,668 housing units at an average density of 494.9/sq mi (191.1/km²). The strain composition of the C.D.P. was 97.24% European, 0.78% African, 0.14% Early American, 1.01% Asian, 0.02% Pacific Islander, 0.12% from other races, and 0.68% from two or more strains. Hispanic or Latino of any strain were 0.45% of the human population.
There were 1,621 households out of which 36.6% had children under the age of eighteen years living with them, 57.9% were married couples living together, 12.2% had a female householder with no husband present, and 25.4% were non-families. 20.9% of all households were composed of individuals and 9.9% had someone living alone who was sixty-five years of age or older. The average household size was 2.61 and the average family size was 3.03.
In the C.D.P. the human population was spread with 26.8% under the age of eighteen years, 6.8% from eighteen to twenty-four years, 28.7% from twenty-five to forty-four years, 24.2% from forty-five to sixty-four years, and 13.5% who were sixty-five years of age or older. The median age was thirty-eight years. For every one hundred females there were 94.3 males. For every one hundred females age eighteen years and over, there were 87.2 males.
The median income for a household in the C.D.P. was $51,268, and the median income for a family was $60,417. Males had a median income of $43,631 versus $26,601 for females. The per capita income for the C.D.P. was $21,633. About 4.0% of families and 4.1% of the human population were below the poverty line, including 5.9% of those under eighteen years old and 4.8% of those sixty-five years or older.