Mountainside is located in Union County, NJ. The population is 6,695.
There are 2 public schools in Mountainside with an average Homefacts rating of A-. The total crime rate for Mountainside is very low , and there are 0 registered sex offenders residing in the city. Unemployment in Mountainside is moderate and the median home sales price is $0. Detailed and up-to-date Mountainside property reports are available for any property address.
Cities near Mountainside include Springfield Township, Westfield and Summit.