What Is a 407 Police Code? 407 Police Code

The 407 police code meaning for the police forces is Unlawful Assembly.

If you’ve ever listened to a police scanner or watched a crime drama, you might have come across the term 407 Police Code and wondered, “What is a 407 police code? ” The 407 police code is a specific shorthand used by law enforcement officers to communicate efficiently over the radio. In many U.S. jurisdictions, especially in California, Police Code 407 refers to Unlawful Assembly.

What Does the 407 Police Code Mean?

The 407 police code meaning is associated with situations involving unlawful assembly, which generally refers to a group of people gathering in a manner that may lead to a disturbance, violence, or the violation of laws. Law enforcement uses this code to quickly alert other units about such incidents, enabling a swift and coordinated response.

So, to directly answer the question:
What is a 407 police code? It is the police radio code for Unlawful Assembly.

What Is Considered an Unlawful Assembly?

Unlawful assembly occurs when a group gathers with the intention of causing disruption, violence, or committing illegal acts. While the right to assemble peacefully is protected under the First Amendment, law enforcement can intervene when a crowd becomes dangerous or violates local laws.

Examples of unlawful assembly include:

Protests that turn violent
Groups gathered to incite riots
Public disturbances involving potential threats to safety

When such an event is reported, officers may refer to it as a Code 407 situation.

Origin of California Police Codes

The use of numeric police codes in California and across the United States originated in the late 1930s. Specifically, the Association of Public-Safety Communications Officials (APCO) introduced the Ten-Signal System in 1937 to streamline police radio communications. These codes allowed officers to communicate quickly and precisely using brief numeric signals instead of lengthy verbal explanations.

Over time, each state or local agency adopted its own version of these codes. In California, the 407 police code is one of many used to handle public safety incidents efficiently and consistently.

What is 407 police code?

It refers to Unlawful Assembly, a critical code used by police to describe gatherings that may lead to disturbances or threats to public order. Understanding codes like 407 police code and 404 police code provides insight into how law enforcement operates and communicates during high-tension situations.

Whether you’re a student of criminal justice, a journalist, or just curious, knowing the meaning behind these police codes can offer valuable context when interpreting real-time police communications.

Main Police Codes
Alphabet For Police
California Penal Codes
Emergency Response Codes
Police 10 Codes
Police 11 Codes
Police Abbreviations
Police Nicknames
Police Radio Codes
Police Scanner Codes
Texas Penal Codes

Your Ultimate Resource for Police Codes in the United States

Welcome to All Police Codes — your most comprehensive online resource for learning and understanding police radio codes, including the widely used 407 Police Code. Whether you’re a civilian enthusiast, aspiring law enforcement officer, or simply curious about how emergency communication works, we’ve built this website with you in mind.

Discover the Meaning Behind Every Police Code

Police codes, also known as ten-codes, are used by law enforcement officers and emergency personnel to communicate quickly and efficiently over radio systems. Our dedicated team has spent years researching, compiling, and updating these extensive police code database to provide accurate and easy-to-understand information for users across the country.

From common police 10-codes to lesser-known signals, you’ll find detailed explanations, context, and real-world usage examples. Whether you’re looking to understand what Police Code 407 means or want to explore other codes like 10-4 (Acknowledgement) or 10-7 (Out of Service), we’ve got it all in one place.

What Is the 407 Police Code?

The 407 Police Code is one of many numeric codes used by law enforcement and emergency services across the United States. While the exact meaning can vary slightly depending on the region or department, 407 generally refers to a specific type of incident or action that officers need to respond to. You can listen to these codes live using a police scanner, which picks up real-time emergency broadcasts and communications.

The History and Evolution of Police Radio Codes

Police codes have a long and fascinating history. They were first introduced between 1937 and 1940 to create standardized, brief radio messages that saved time and reduced radio chatter. The codes were later formalized and expanded in 1974 by the Association of Public-Safety Communications Officials-International (APCO).

Originally, APCO proposed Morse code brevity codes in The APCO Bulletin (June 1935), adapted from U.S. Navy communication protocols. Although initially intended for Morse code, these procedures were gradually adopted and transformed for voice communication. Over time, police codes have evolved to meet the growing demands of public safety and efficient response.

Why We Created This Police Code Guide

At All Police Codes, we are passionate about supporting emergency responders and the systems they use to keep us safe. Our mission is to make police codes accessible and understandable to everyone. That’s why all the information on our website is completely free to access — no subscriptions or paywalls.

We do this because we believe in the importance of public safety education and transparency. Our site is supported by advertising to help cover the costs of hosting and maintaining this ever-growing knowledge base.

Commonly Used Police Codes You Should Know

Some of the most frequently used police codes include:

10-4—Message received
10-7 – Out of service
10-8 – In service
10-20 – Location
10-42 – End of tour (used when an officer finishes duty or retires)

For example, when an officer finishes a shift or retires, they traditionally report using the 10-7 and 10-42 codes — a moment often honored with deep respect in the law enforcement community.

Learn, Listen, and Stay Informed

If you’re interested in staying up-to-date with police activity in your area, consider getting a police scanner app or device. These allow you to hear real-time transmissions using the same codes you’ve learned on our website.

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