As of the census of 2000, there were 5,606 people, 2,448 households, and 1,571 families residing in the borough. The population density was 1,615.3/km² (4,180.8/mi²). There were 2,570 housing units at an average density of 740.5/km² (1,916.6/mi²). The racial makeup of the borough was 98.20% White, 0.30% African American, 0.07% Native American, 0.20% Asian, 0.68% from other races, and 0.55% from two or more races. Hispanic or Latino of any race were 2.48% of the population.
There were 2,448 households out of which 24.7% had children under the age of 18 living with them, 51.2% were married couples living together, 10.3% had a female householder with no husband present, and 35.8% were non-families. 30.5% of all households were made up of individuals and 17.2% had someone living alone who was 65 years of age or older. The average household size was 2.29 and the average family size was 2.85.
In the borough the population was spread out with 20.2% under the age of 18, 6.6% from 18 to 24, 29.0% from 25 to 44, 21.2% from 45 to 64, and 23.1% who were 65 years of age or older. The median age was 42 years. For every 100 females there were 89.3 males. For every 100 females age 18 and over, there were 86.2 males.
The median income for a household in the borough was $39,651, and the median income for a family was $49,604. Males had a median income of $37,935 versus $26,322 for females. The per capita income for the borough was $20,119. About 4.1% of families and 4.6% of the population were below the poverty line, including 6.5% of those under age 18 and 3.3% of those age 65 or over.
The Borough is served by the Saucon Valley School District.
Hellertown is home to one radio station, an internet radio station, and the only radio station ever based in Hellertown - vM Radio. The station is broadcast online 24 hours a day, playing mostly the rock genre, along with alternative. It also sponsors many events related to music in this area.