Police and sheriff · Illinois

Law Enforcement Agencies in LaSalle County, Illinois

18 agenciesFBI UCR list

The FBI's Uniform Crime Reporting program lists 18 law enforcement agencies in LaSalle County, Illinois: the county sheriff's office, 16 city or town police departments and 1 other agency.

Sheriff's Office and County Police in LaSalle County

  • La Salle County Sheriff's OfficeCounty sheriff or police · ORI IL0500000 · NIBRS since 2021

City and Town Police Departments in LaSalle County

  • Dana Police DepartmentCity or town police · ORI IL0502400
  • Earlville Police DepartmentCity or town police · ORI IL0501100 · NIBRS since 2025
  • Grand Ridge Police DepartmentCity or town police · ORI IL0501300 · NIBRS since 2021
  • La Salle Police DepartmentCity or town police · ORI IL0500100 · NIBRS since 2021
  • Leland Police DepartmentCity or town police · ORI IL0500200 · NIBRS since 2022
  • Marseilles Police DepartmentCity or town police · ORI IL0500300 · NIBRS since 2022
  • Mendota Police DepartmentCity or town police · ORI IL0500400 · NIBRS since 2022
  • North Utica Police DepartmentCity or town police · ORI IL0501700 · NIBRS since 2022
  • Oglesby Police DepartmentCity or town police · ORI IL0500600 · NIBRS since 2021
  • Ottawa Police DepartmentCity or town police · ORI IL0500700 · NIBRS since 2021
  • Peru Police DepartmentCity or town police · ORI IL0500800 · NIBRS since 2022
  • Seneca Police DepartmentCity or town police · ORI IL0500900 · NIBRS since 2021
  • Sheridan Police DepartmentCity or town police · ORI IL0501500
  • Somonauk Police DepartmentCity or town police · ORI IL0190400 · NIBRS since 2021
  • Streator Police DepartmentCity or town police · ORI IL0501000 · NIBRS since 2021
  • Tonica Police DepartmentCity or town police · ORI IL0501600 · NIBRS since 2024

Other Law Enforcement Agencies in LaSalle County

  • Tri-County Drug Enforcement Narcotics TeamOther agency · ORI IL0502200 · NIBRS since 2020

Where People Arrested in LaSalle 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 Illinois 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 LaSalle County?
The FBI lists 18 law enforcement agencies in LaSalle County, including 16 city or town police departments. The full list is on this page.
Who runs the jail in LaSalle County?
In most counties the sheriff runs the county jail. In LaSalle County that is the La Salle County Sheriff's Office. See LaSalle 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 IL0500400. It is useful when you request records or read crime statistics.