Reviewed and updated October 9, 2026 by the SearchSystems.net editorial team. The arrest and crime counts are the ones each agency reported to the FBI, as the FBI held them on October 8, 2026. Every office link was opened and checked against the office's own site between September 23, 2026 and September 26, 2026.
Mount Arlington, New Jersey, in Morris County, has about 6,000 residents (2024 Census Bureau estimate). A police report belongs to the agency whose officer wrote it, so which office holds a report from Mount Arlington depends on where the incident happened. This guide names each agency, where its records page is and what the Open Public Records Act requires of it.
This guide covers which agency, the city's records page, the sheriff's reports, what the law requires and common questions.
Related guides: Mount Arlington public records, Morris County police reports, Mount Arlington arrest records, Mount Arlington warrants, Mount Arlington inmate search, Mount Arlington criminal records, New Jersey arrest records and New Jersey inmate search.
Which Agency Holds a Report from Mount Arlington
The report of an incident is released by the agency that took it; the court and the jail hold their own records of the same event, but not the report.
Inside Mount Arlington that is the agency that reports to the FBI for the city (filed by the FBI as Mount Arlington Police Department); outside it, the Morris County Sheriff's Office.
The FBI's list also places the Morris County State Police in Morris County; a report taken on a state highway by it comes from that agency's own records office.
The FBI's list also carries Prosecutor in Morris County and the Morris County Park Police (other agency), each with a records office of its own.
Reports from the Mount Arlington Police
For Mount Arlington, SearchSystems opened and checked the Mount Arlington police records page at mountarlingtonnj.org/how-do-i-obtain-a-police-report (page title: How Do I Obtain a Police Report? | Borough of Mount Arlington), phone 973-398-2100, 520 Altenbrand Ave. Mount Arlington NJ 07856, which answered when SearchSystems opened it on September 26, 2026.
The agency that reports for Mount Arlington had 0 violent and 10 property crimes reported for 2025 and reported 92 arrests for 2025.
Reports from the Morris County Sheriff's Office
The Morris County Sheriff's Office is the county agency; it had 0 violent and 0 property crimes reported for 2025 and reported 223 arrests for 2025.
Its reports come from its records unit, reached through the office at 973-631-5412. The office's page SearchSystems verified is its jail page, at morriscountynj.gov/Departments/Jail (page title: Jail | Morris County, NJ), phone 973-631-5412, which answered when SearchSystems opened it on September 23, 2026.
What the Open Public Records Act Requires
The Open Public Records Act sets the rules: an answer within 7 business days, at a charge of copying at 5 cents a page for letter size, from the agency that holds the report.
Any other county record goes through the county records request page SearchSystems verified, at morriscountynj.gov/Government/Open-Government/County-Open-Public-Re... (page title: Open Public Records Request (OPRA) | Morris County, NJ).
A defendant who has been charged gets the report through the case: the County Prosecutor, (973) 285-6200, handles discovery for pending cases.
Frequently Asked Questions
How do I get a police report in Mount Arlington?
From the agency that took it. The Mount Arlington police records page is at mountarlingtonnj.org, phone 973-398-2100; the sheriff's reports come from the Morris County Sheriff's Office.
How long does an agency in Mount Arlington have to answer?
Under the Open Public Records Act, within 7 business days. It may charge copying at 5 cents a page for letter size.
Who has a crash report from a state highway in Mount Arlington?
The state agency whose officer took it; the FBI lists the Morris County State Police in Morris County.
How do I get a report from the Morris County Sheriff's Office?
From its records unit, reached through the office at 973-631-5412. Under the Open Public Records Act the answer is due within 7 business days.
Is this the official Mount Arlington website?
No. SearchSystems.net is an independent public records guide, online since 1997. It links to the official city, county, court and state offices described above and does not hold records, charge for them or take requests.