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General Information

The Sheriff's main office is located in the historic city of Trenton in the Civil Court House. This agency also maintains two other separate operations centers at the Criminal Court House and the Trenton-Mercer Airport. At the current time there are over 140 sworn personnel and 60 civilian employees.

The Sheriff's Office is comprised of several units including Court Security, Emergency Response Team, K-9, Civil Process, Detective Bureau / Fugitive Unit, Community Education Programs, Transportation, Task Forces Federal, State and Local and Airport Patrol.

Mercer County Sheriff's Office
Mercer County Court House
175 South Broad Street
Trenton, NJ 08650
(609) 989-6111

Administrative Staff

  • Sheriff John A. "Jack" Kemler
  • Undersheriff Pedro Medina
  • Undersheriff Jessica Plumeri
  • Undersheriff Jason Salvatore
  • Chief Sheriff's Officer Christopher Kenyon
  • Chief Warrant Officer Brian Amantia
  • Assistant to the Sheriff, Cathleen G. Garton

Meet the Sheriff

I am proud to serve as Sheriff of Mercer County, an office that provides for an integral part of the Criminal Justice System in our county. My involvement in law enforcement spans more than twenty years, and includes duties as Sheriff of Mercer County since 2010.

The following pages illustrate the many aspects of our Office, our accomplishments over the past years and re-affirms our pledge to you, the citizens of Mercer County to continue our tradition of dedicated, high quality law enforcement. We hope this web site will answer any questions you may have about this office.

As Mercer County's Sheriff, John A. "Jack" Kemler brings with him a law enforcement background that spans three decades." In 1983, Kemler started his police career as a patrol officer working for the                   Sheriff John A. Kemler   Trenton Police Department. His assignments included stints as a K-9 handler, narcotics officer and a                                         detective in the Criminal Investigation Bureau. In 1998, he was promoted to Sergeant and was assigned to Criminal Investigation Bureau, where he supervised the Violent Crimes Squad.

Throughout his career, Jack Kemler has received numerous awards and accommodations, but is most proud of being selected the Trenton Kiwanis' Officer of the Year in 1990. This annual award is presented to the officer that most exemplifies professionalism and valor and is given by his and her fellow officers.

In December 2002, he was appointed Chief Sheriff Officer of the Mercer County Sheriff's Office. During his eight years at the Sheriff's Office, Kemler has also held the titles of Chief Warrant Officer and Undersheriff and has overseen all aspects of the Office.

Under Jack Kemler's leadership, the Mercer County Sheriff's Office continues its long-standing history of working closely with Federal, State and local law enforcement agencies to keep our communities safe. The Sheriff's Office maintains its charge to serve warrants, on behalf of the courts and to apprehend fugitives with swiftness and efficiency. The Sheriff's Fugitive Unit maintains a strong working relationship with the United States Marshal's New York / New Jersey Regional Fugitive Task Force and the Mercer County Prosecutor's Office. Highly skilled Fugitive Unit officers are also assigned to the Special Investigations Unit (SIU) as well as the Homicide Task Force, both under the direct supervision of the Mercer County Prosecutor's Office. Sheriff's Officers are also assigned to assist the Trenton Police Department's Warrant Taskforce. Additionally, Command Officers under the purview of Sheriff Kemler participate in weekly briefings that coordinate Federal, State and local responses to criminal activity in the greater Trenton area.

Lastly, under Sheriff Kemler's direction, the Mercer County Sheriff's Office has experienced overwhelming support from the media and the public for the revival of "Mercer's Most Wanted" - to apprehend fugitives who roam our streets.

What is a Sheriff?

Mention the word "sheriff" and many people's minds will fill immediately with images of shootouts and gunfights in the Wild West. Such is the power of old movies and television series, which have so magnified the role of the nineteenth-century American sheriff that it is now virtually impossible to think of sheriff's as existing in any other place or time. Most people would be surprised to know that the office of sheriff has a proud history that spans well over a thousand years, from the early Middle Ages to our own "high-tech" era.

The Office of the Sheriff is the oldest law enforcement office known within the common law system. The Title of Sheriff is first referenced in DANIEL, CHAPTER 3 of the King James translation of the Old Testament. The Office of the Sheriff is the only elected law enforcement office in the country. Today, with some variations from state to state, the duties of the Office of the Sheriff have remained consistent.

Although the duties of the sheriff vary from jurisdiction to jurisdiction, the Sheriff's Office is generally active in all three branches of the criminal justice system: law enforcement, the courts, and corrections.

The sale of property has been the responsibility of the Office of the Sheriff for over seven hundred years and this function is still performed to this day. The authority over bailiffs, constables, wardens and the jail are a continuing responsibility along with court safety and the service of warrants. Today's Office of the Sheriff has not only continued the responsibilities of the past, but has expanded it's duties to adapt to a modern world.