Mountainside is located in New Jersey. Mountainside, New Jersey has a population of 6,813. Mountainside is less family-centric than the surrounding county with 30% households with children. The county percentage for households with children is 34%.
The median household income in Mountainside, New Jersey is $122,540. The median household income for the surrounding county is $83,669 compared to the national median of $66,222. The median age of people living in Mountainside is 50.1 years.
The average high temperature in July is 85.74 degrees, with an average low temperature in January of 19.1 degrees. The annual precipitation is 51.23.