Livingston County Prosecutor
Monday - Friday
8am - 5pm
Office Closed
Noon – 1pm
210 S Highlander Way
Howell, MI 48843
Ph:  517.546.1850
Fax:  517.546.0728
Email: Prosecutor
Family Support
Ph: 517.548.1444
Fax: 517.548.7580


The Prosecuting Attorney is an elected official with a four-year term of office, as provided by the Michigan Constitution. Elections occur at the time of the Presidential election, on the partisan ballot. The Prosecuting Attorney is independent of the Michigan Attorney General. The Prosecuting Attorney's office is responsible for a wide array of legal functions for Livingston County, some of which include

 William J. Vailliencourt, Jr.

 Office Responsibilities

  • Chief law enforcement official in the County
  • Reviews, authorizes and prosecutes violations of felony and misdemeanor criminal laws of the State of Michigan committed inside the County
  • Authorizes and prosecutes felony & misdemeanor juvenile delinquency offenses
  • Represents the People of the State of Michigan in criminal matters before the District & Circuit Courts; juvenile delinquency, parental neglect and miscellaneous probate matters in the Circuit Court/Family Division and the Probate Court, and appeals in the Court of Appeals and Michigan Supreme Court
  • Prepares child abuse and neglect petitions, and prosecute actions to terminate parental rights
  • Attends contested mental health commitment hearings
  • Files and prosecutes actions to establish paternity and family support order