Reviewed and updated October 9, 2026 by the SearchSystems.net editorial team. The arrest counts are the ones the agency reported to the FBI, through 2025. The jail figures are from the Vera Institute of Justice's Incarceration Trends data. 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), and its arrests are reported to the FBI by an agency of its own. An arrest in the city leaves the same records whoever makes it: the arresting agency's report, the record of anyone held at the county jail, and, if the County Prosecutor files charges, a case in the Superior Court of New Jersey, Morris County. This guide says who keeps each one, what it costs and who may see it, with the arrest counts the agency reported.
This guide covers who makes arrests, how many arrests, booking and the jail, finding an arrest, copies and common questions.
Related guides: Mount Arlington public records, Morris County arrest records, New Jersey arrest records and New Jersey inmate search.
Who Makes Arrests in Mount Arlington
The FBI lists Mount Arlington with an arrest reporting agency of its own, filed as Mount Arlington Police Department. It reported 92 arrests for 2025. A city is listed separately whether the officers are the city's own or the sheriff's under contract; the FBI's list does not say which.
Outside the city, the Morris County Sheriff's Office is the county agency. It reported 223 arrests for 2025.
The FBI's agency list also places these agencies in Morris County: Prosecutor in Morris County and the Morris County Park Police (other); the Morris County State Police (state police).
How Many Arrests Mount Arlington Reports
Each agency reports its arrests to the FBI by month, and the FBI publishes them on the Crime Data Explorer. These are the full-year totals, all offenses, as the FBI held them on October 8, 2026; a year with months missing or not reported is left out.
- Mount Arlington: 92 for 2025, 92 for 2024, 104 for 2023, 127 for 2022 and 288 for 2019; 2020 and 2021 are missing months.
Across Morris County, the 36 agencies with all twelve months of 2025 on file reported 4,472 arrests between them.
Booking: Where People Arrested in Mount Arlington Are Held
A person kept in custody after an arrest in Mount Arlington is held at the county jail, whichever agency made the arrest, apart from the short stay some city departments' own holding cells allow; a person cited and released at the scene is not booked at all. The jail's record of each person held, with the charges, is a public record of the arrest, and the court file takes over from there.
On an average day in 2023 the jail held about 240 people, up from about 190 in 2019. Its rated capacity in 2023 was 524 beds, and it ran at 45 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
SearchSystems opened and checked the jail page of the Morris County Sheriff's Office 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.
A sentence of more than a year is served in state prison; the New Jersey Department of Corrections lists its inmates at www20.state.nj.us/DOC_Inmate/inmatefinder?i=I.
How to Find Out About an Arrest in Mount Arlington
An arrest in Mount Arlington can be traced in two places, depending on where the case stands: the case index of the Superior Court of New Jersey, Morris County, which shows whether charges were filed and the next court date (the court records page SearchSystems verified is at morriscountynj.gov/Government/Court-System, phone 862-397-5700); the County Prosecutor, which decides whether an arrest becomes a charge (its page is at morriscountynj.gov/Departments/Prosecutor, phone (973) 285-6200).
Statewide, New Jersey Courts Public Access is the Judiciary's free online case search for civil and criminal cases.
New Jersey does not let the public search another person's statewide criminal history. The record kept by the New Jersey State Police goes to the person it belongs to and to employers and agencies the law authorizes; for everyone else the court's own case index is the public record of an arrest that led to a charge.
Getting a Copy of an Arrest Record in Mount Arlington
The report of an arrest is released by the agency that made it; the jail and the court hold their own records of the same event, but not the report. Under the Open Public Records Act the agency must answer within 7 business days, and it may charge copying at 5 cents a page for letter size.
- An arrest by the Mount Arlington police: the police records page SearchSystems verified 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.
- An arrest by the Morris County Sheriff's Office: ask its records unit, reached through the office at 973-631-5412.
- A defendant who has been charged gets the report through the case: the County Prosecutor, (973) 285-6200, handles discovery for pending cases.
- The court file of a case that was filed: the Superior Court of New Jersey, Morris County, through the court records page at morriscountynj.gov/Government/Court-System, phone 862-397-5700.
- Any county record that is not posted: the county records request page SearchSystems verified is at morriscountynj.gov (page title: Open Public Records Request (OPRA) | Morris County, NJ).
- Your own statewide record: a fingerprint-based request to the State Police.
The Morris County guide covers every agency in the county: Morris County arrest records.
Frequently Asked Questions
How many arrests are made in Mount Arlington each year?
Mount Arlington reported 92 arrests to the FBI for 2025, its latest full year.
How do I find out if someone is in jail in Mount Arlington?
Ask the Morris County Sheriff's Office at 973-631-5412; its jail page SearchSystems verified is at morriscountynj.gov/Departments/Jail.
Where are people arrested in Mount Arlington booked?
Those kept in custody go to the county jail, run by the Morris County Sheriff's Office; a person cited and released at the scene is not booked.
Are arrest records public in Mount Arlington?
The court files of criminal cases in the Superior Court of New Jersey, Morris County are public and can be looked up through the court. The statewide criminal history kept by the New Jersey State Police is not public; you can get your own. The arrest report itself is released by the agency that made the arrest, under the Open Public Records Act.
How do I get a copy of an arrest report in Mount Arlington?
From the agency that made the arrest: the Mount Arlington police for its own arrests, the Morris County Sheriff's Office for the sheriff's. Under the Open Public Records Act the answer is due within 7 business days; the county records request page SearchSystems verified is at morriscountynj.gov.
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.