🌐EnglishEnglishDeutschEspañolFrançaisItalianoNederlandsPolskiPortuguêsSvenskaTürkçeРусскийالعربيةفارسی中文日本語EntityQ1014338· pop 34· linked from 226 articlesMountainsideAlso known as Mountainside, New Jersey, Mountainside, NJborough in Union County, New Jersey, United StatesWikidata factsOfficial websitewww.mountainside-nj.comImageEcho Lake Park in Mountainside NJ autumnal scene.jpgDialing code908Sources (10)wikidata.orgnj.govdata.census.govarchinform.neten.wikipedia.orgOn the mapAvailable in 34 languagesEspañolFrançaisDeutsch中文РусскийPortuguêsItalianoالعربيةBasqueCatalanConnectionsrace and ethnicity in the United States CensusEntityEastern Time ZoneEntityCategories1895 establishments in New JerseyBoroughs in New JerseyBoroughs in Union County, New JerseyFaulkner Act (mayor–council)Mountainside, New JerseyPopulated places in the United States established in 1895