Mountainside, NJ Public Records
Mountainside is an incorporated borough in Union County, New Jersey, with an estimated population of 7,228 (U.S. Census Bureau, July 2024 estimate) and 4.0 square miles of land. That is up about 204 residents since the 2020 Census base.
🏢 Mountainside Borough Office
Mountainside's own borough government keeps its local records: council or board meeting minutes, local ordinances and resolutions, local permits and licenses, and its own budget and contracts. Requests for those records go to the borough clerk under New Jersey's Open Public Records Act (OPRA). In New Jersey, every municipality has a local registrar who issues certified copies of birth, marriage and death records for events in that municipality, and marriage licenses are applied for there, so the municipal office is the first stop for vital records.
📇 Mountainside Contact on File
| Government | Borough Of Mountainside |
| Contact listed | Municipal Clerk |
| Mailing address | 1385 US Highway 22, 1, Mountainside, NJ 07092 |
| Phone | Not stated |
| Official website | www.mountainside-nj.com |
| Source | U.S. Census Bureau, 2022 Census of Governments: Government Units listing ↗ |
This is the mailing address the government reported to the U.S. Census Bureau; it may be a post office box or the office of an elected official rather than a public counter, and the source does not list a phone number. The website was reported by the government and was answering when we last checked. Call or check the official website before you visit.
↑ Back to record types🏛️ County Courthouse & Records Office for Mountainside
Mountainside is in Union County. In New Jersey, deeds, mortgages and other land records are recorded by the County Clerk or county Register of Deeds. Divorce cases in New Jersey are heard by the Superior Court of New Jersey, Family Part, in each county. Wills and estates in New Jersey are handled by the County Surrogate's office and the Superior Court.
📍 Union County at a Glance
| County | Union County |
| County population (2024 est.) | 594,160 Source: www2.census.gov ↗ |
⚖️ Union County Courthouse
| Address | 2 Broad Street, Elizabeth, New Jersey 07207 |
| Directions | Get directions ↗ |
| Phone | (908) 787-1650 |
| Hours | Mon - Fri: 8:30 a.m. - 4:30 p.m. |
| Records available | New Jersey Superior Court case records (civil, criminal, family) for the county |
| Official website | njcourts.gov |
| Sources | njcourts.gov/…/union ↗ |
| Last verified | October 16, 2026 |
See the full Union County records page →
↑ Back to record types📋 Where to Get Records for Mountainside
Where to get the most-requested public records for people and property in Mountainside, NJ:
📋 Mountainside Records Guide
| Birth & death certificates | New Jersey Department of Health – Vital Statistics and RegistryIn New Jersey, every municipality has a local registrar who issues certified copies of birth, marriage and death records for events in that municipality, and marriage licenses are applied for there, so the municipal office is the first stop for vital records. |
| Deeds & property records | In New Jersey, deeds, mortgages and other land records are recorded by the County Clerk or county Register of Deeds. |
| Court cases & divorce | Union County courthouse. Divorce cases in New Jersey are heard by the Superior Court of New Jersey, Family Part, in each county. |
| Wills & estates | Wills and estates in New Jersey are handled by the County Surrogate's office and the Superior Court. |
| State court system | New Jersey Courts |
| Sex offender registry | New Jersey Sex Offender Internet Registry (NJ State Police) |