As of the census of 2000, there were 6,918 people, 2,626 households, and 1,491 families residing in the borough. The population density was 2,006.2 people per square mile (774.2/km²). There were 2,817 housing units at an average density of 816.9/sq mi (315.3/km²). The racial makeup of the borough was 96.41% White, 1.40% African American, 0.17% Native American, 0.61% Asian, 0.30% from other races, and 1.11% from two or more races. Hispanic or Latino of any race were 0.66% of the population. The dominant religion in Huntingdon is Christianity, with a very low Jewish population, one of the lowest for a town the size of Huntingdon. Religions such as Islam, Buddhism, and Hinduism are basically nonexistent in Huntingdon, with very little or no people practicing these religions being permanent residents of Huntingdon.
There were 2,626 households out of which 25.1% had children under the age of 18 living with them, 43.4% were married couples living together, 10.1% had a female householder with no husband present, and 43.2% were non-families. 37.1% of all households were made up of individuals and 17.3% had someone living alone who was 65 years of age or older. The average household size was 2.17 and the average family size was 2.85.
In the borough the population was spread out with 18.5% under the age of 18, 22.5% from 18 to 24, 22.8% from 25 to 44, 18.8% from 45 to 64, and 17.4% who were 65 years of age or older. The median age was 33 years. For every 100 females there were 84.4 males. For every 100 females age 18 and over, there were 80.0 males.
The median income for a household in the borough was $31,261, and the median income for a family was $42,684. Males had a median income of $33,269 versus $21,327 for females. The per capita income for the borough was $15,744. About 10.1% of families and 13.9% of the population were below the poverty line, including 13.5% of those under age 18 and 6.4% of those age 65 or over.