Ambler is a borough in Montgomery County, Pennsylvania, in the United States, approximately 16 miles (26 km) northwest of Philadelphia.
Ambler was originally known as the Village of Wissahickon, named for the North Pennsylvania Railroad depot established there in the mid-1850s. The town was renamed to Ambler in 1869 in honor of Mary Johnson Ambler, a local Quaker woman who heroically assisted during The Great Train Wreck of 1856, a local train accident in which 59 people were killed instantly and dozens more died from their injuries.
As of the census of 2000, there were 6,426 people, 2,510 households, and 1,598 families residing in the borough. The population density was 7,605.8 people per square mile (2,953.7/km). There were 2,605 housing units at an average density of 3,083.3/sq mi (1,197.4/km). The racial makeup of the borough was 83.29% White, 12.03% African American, 0.25% Native American, 2.47% Asian, 0.06% Pacific Islander, 0.50% from other races, and 1.40% from two or more races. Hispanic or Latino of any race were 2.13% of the population.
There were 2,510 households out of which 29.9% had children under the age of 18 living with them, 45.7% were married couples living together, 13.9% had a female householder with no husband present, and 36.3% were non-families. 30.2% of all households were made up of individuals and 11.2% had someone living alone who was 65 years of age or older. The average household size was 2.45 and the average family size was 3.08.
In the borough the population was spread out with 23.5% under the age of 18, 7.0% from 18 to 24, 32.5% from 25 to 44, 19.7% from 45 to 64, and 17.4% who were 65 years of age or older. The median age was 37 years. For every 100 females there were 86.5 males. For every 100 females age 18 and over, there were 81.8 males.
The median income for a household in the borough was $47,014, and the median income for a family was $51,235. Males had a median income of $40,305 versus $30,735 for females. The per capita income for the borough was $21,688. About 2.4% of families and 5.5% of the population were below the poverty line, including 6.8% of those under age 18 and 4.9% of those age 65 or over.