Ace the Introduction to Criminal Justice 2026 – Crime Solving Begins Here!

The United States Marshals Service is recognized as the oldest federal law enforcement agency in the United States, established in 1789. The Marshals were created to enforce federal laws and assist in the administration of justice, making them a fundamental component of the early federal law enforcement framework.

In contrast, the New York City Police Department, the Los Angeles Police Department, and the Chicago Police Department were all established later in the 19th century. The New York City Police Department was founded in 1845, while the Los Angeles Police Department and Chicago Police Department were established in 1869 and 1835, respectively. Each of these departments played significant roles in local law enforcement but were not the first in the country; their foundations came after the establishment of the U.S. Marshals Service.

Thus, the U.S. Marshals Service holds the distinction of being the oldest, highlighting its historical importance in the evolution of policing and law enforcement in the United States.