Montgomeryville is a census-designated place (CDP) in Montgomery County, Pennsylvania, United States. The population was 12,624 at the 2010 census. Montgomeryville is about 30 miles from the center of Philadelphia. According to a 2010 Forbes magazine/Yahoo.com survey, Montgomeryville ranks 5th in America’s top 10 affordable suburbs.  It is part of the North Penn Valley region that is centered around the borough of Lansdale.
Montgomeryville is located at (40.250388, -75.237819).
According to the United States Census Bureau, the CDP has a total area of 4.8 square miles (12 km2), all of it land.
As of the 2010 census, there were 12,624 people residing in the CDP. The racial makeup of the CDP was 77.5% White Non-Hispanic,14.6% Asian, 4.4% African American, 0.06% American Indian, 1.1% were two or more races, and 0.07% were some other race. 2.3% of the population were of Hispanic or Latino ancestry.
As of the census of 2000, there were 12,031 people, 4,114 households, and 3,278 families residing in the CDP. The population density was 2,521.8 people per square mile (973.8/km2). There were 4,158 housing units at an average density of 871.5/sq mi (336.6/km2). The racial makeup of the CDP was 87.55% White, 3.26% African American, 0.06% Native American, 7.75% Asian, 0.02% Pacific Islander, 0.40% from other races, and 0.96% from two or more races. Hispanic or Latino of any race were 1.37% of the population.
There were 4,114 households, out of which 43.4% had children under the age of 18 living with them, 70.7% were married couples living together, 6.4% had a female householder with no husband present, and 20.3% were non-families. 16.2% of all households were made up of individuals, and 3.5% had someone living alone who was 65 years of age or older. The average household size was 2.87 and the average family size was 3.26.
In the CDP, the population was spread out, with 29.9% under the age of 18, 4.5% from 18 to 24, 33.8% from 25 to 44, 23.2% from 45 to 64, and 8.6% who were 65 years of age or older. The median age was 36 years. For every 100 females there were 97.1 males. For every 100 females age 18 and over, there were 93.1 males.
The median income for a household in the CDP was $80,097, and the median income for a family was $90,391. Males had a median income of $55,777 versus $38,796 for females. The per capita income for the CDP was $28,967. About 1.7% of families and 1.9% of the population were below the poverty line, including 1.4% of those under age 18 and 2.8% of those age 65 or over.