Police and sheriff · California

Law Enforcement Agencies in Marin County, California

13 agenciesFBI UCR list

The FBI's Uniform Crime Reporting program lists 13 law enforcement agencies in Marin County, California: the county sheriff's office, 9 city or town police departments, 1 state police post, 1 campus police department and 1 other agency.

Sheriff's Office and County Police in Marin County

  • Marin County Sheriff's OfficeCounty sheriff or police · ORI CA0210000

City and Town Police Departments in Marin County

  • Belvedere Police DepartmentCity or town police · ORI CA0210100
  • Central Marin Police DepartmentCity or town police · ORI CA0211700 · NIBRS since 2022
  • Fairfax Police DepartmentCity or town police · ORI CA0210300 · NIBRS since 2022
  • Mill Valley Police DepartmentCity or town police · ORI CA0210500
  • Novato Police DepartmentCity or town police · ORI CA0210600 · NIBRS since 2021
  • Ross Police DepartmentCity or town police · ORI CA0210700 · NIBRS since 2022
  • San Rafael Police DepartmentCity or town police · ORI CA0210900 · NIBRS since 2021
  • Sausalito Police DepartmentCity or town police · ORI CA0211000
  • Tiburon Police DepartmentCity or town police · ORI CA0211100

State Police in Marin County

  • Highway Patrol: Marin Area OfficeState police · ORI CA0219950 · NIBRS since 2021

College and University Police in Marin County

  • Marin Community CollegeCollege or university police · ORI CA0211300 · NIBRS since 2022

Other Law Enforcement Agencies in Marin County

  • Union Pacific Railroad: Marin CountyOther agency · ORI CA021120X · NIBRS since 2025

Where People Arrested in Marin County Are Held

In most U.S. counties, adults arrested by city police, the sheriff or state troopers are booked into the county jail first. Some larger cities run their own holding jail, so if a person is not on the county roster, call the arresting department.

Law Enforcement in Other California Counties

Agency names, types and ORI codes come from the FBI Crime Data Explorer agency list, retrieved November 2026. NIBRS dates show when an agency began reporting incident-level crime data to the FBI.

Frequently Asked Questions

How many police departments are in Marin County?
The FBI lists 13 law enforcement agencies in Marin County, including 9 city or town police departments. The full list is on this page.
Who runs the jail in Marin County?
In most counties the sheriff runs the county jail. In Marin County that is the Marin County Sheriff's Office. See Marin County Jail on this site for the jail's roster or contact details.
What is an ORI number?
An ORI is the nine-character identifier the FBI assigns to each law enforcement agency for crime reporting, for example CA0210700. It is useful when you request records or read crime statistics.