What Is a 10-10 Police Code? 10-10 Police Code

The 10-10 police code meaning for the police forces is Negative or Fight In Progress.

If you’ve ever listened to police scanners or watched crime dramas, you may have heard the term 10-10 police code. But what is 10-10 police code, exactly? In police communication, the 10-10 code typically stands for “Negative” or “Fight in Progress”, depending on the jurisdiction.

Understanding the 10-10 Police Code

The 10-10 police code is part of the ten-code system—a standardized method used by law enforcement officers and emergency responders to communicate quickly and efficiently over radio systems. Originally developed in the 1930s, ten-codes have been widely adopted to reduce miscommunication and increase the clarity of radio transmissions.

In most police departments across the United States, 10-10 can signify two main things:

“Negative” – Indicating a negative response or denial.
“Fight in Progress” – Signaling that officers are responding to or observing a physical altercation or disturbance.

The specific meaning can vary slightly depending on the city, county, or agency, as not all departments use the exact same ten-code definitions. However, these two meanings are the most commonly associated with police code 10-10.

Why Police Use Codes Like 10-10

Law enforcement officers use codes like the 10-10 code to streamline communication. Rather than speaking in full sentences—especially in high-pressure or time-sensitive situations—officers can quickly relay critical information using short numeric codes. This helps reduce radio traffic, prevent misunderstandings, and speed up response times.

For example:

Instead of saying, “We have a fight going on at the corner of 5th and Main,” an officer might simply radio in “10-10 at 5th and Main.”
Instead of responding with “No” or “Negative,” an officer can say “10-10” to confirm a negative response.

This concise language makes it easier for police departments, dispatchers, and emergency teams to maintain clear and effective communication during potentially chaotic situations.

Is the 10-10 Police Code Used Everywhere?

The usage of the 10-10 police code is not universal. While many law enforcement agencies across the U.S. still use ten-codes, others have moved toward plain language communication to avoid confusion—especially when working with other departments or during multi-agency responses.

Despite this shift, the 10-10 code remains a recognizable and commonly used part of police radio jargon, particularly in regions that continue to rely on the traditional ten-code system.

What Is 10-10 Police Code?

The 10-10 police code is a short, standardized communication signal used by police and emergency personnel. It usually means either:

Negative (a denial or “no” response), or
Fight in Progress (an active or observed altercation).

Whether you’re listening to a police scanner, studying law enforcement procedures, or simply curious about how officers communicate, understanding the meaning behind codes like 10-10 can give you deeper insight into the fast-paced world of public safety and emergency response.

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Welcome to the Ultimate Police Codes Lookup Resource – Your Guide to Understanding the 10-10 Police Code and More

Welcome to our comprehensive online police codes database – your go-to source for learning about U.S. police codes, including the widely used 10-10 police code. Whether you’re curious about what specific codes mean or want to explore how law enforcement communicates, you’re in the right place. Our mission is to help you understand police radio codes, signals, and emergency communication protocols used by officers across the United States.

We’ve spent years researching, analyzing, and organizing an extensive collection of police 10-codes, signals, and dispatch terms to bring you accurate and up-to-date information. These codes are vital tools in law enforcement and public safety communication, allowing police officers, dispatchers, and emergency personnel to relay information quickly and clearly, especially in critical and time-sensitive situations.

What is the 10-10 Police Code?

The 10-10 police code is part of the widely adopted ten-code system used by law enforcement and emergency responders across the country. While the meaning of codes can vary by jurisdiction, 10-10 often indicates that an officer is “Out of service – subject to call” or simply “Transmission completed, standing by“. It’s one of many police scanner codes that can be heard by those monitoring law enforcement radio frequencies.

To hear the 10-10 code and others in real-time, many enthusiasts use police radio scanners or scanner apps, which allow public access to police communications in certain areas.

A Brief History of Police 10 Codes

Police codes, also known as ten signals or ten-codes, were first introduced between 1937 and 1940 to improve radio communication clarity. These codes were later standardized and expanded in 1974 by the Association of Public-Safety Communications Officials-International (APCO). APCO originally proposed Morse code brevity symbols in a 1935 issue of The APCO Bulletin, drawing inspiration from the U.S. Navy’s communication methods. Although initially designed for Morse code, these brevity codes evolved into the voice-based codes used by law enforcement agencies today.

Commonly Used Police Codes

Among the most symbolic uses of police codes is when an officer retires or ends a shift. In such cases, they often use:

10-7 – Out of Service
10-42 – End of Tour of Duty

These codes are not only operationally functional but also carry emotional weight, particularly when used in ceremonial or memorial contexts.

Why We Built This Police Code Lookup Site

Our team is passionate about law enforcement communication and the systems that keep our emergency services running efficiently. That’s why we created this free police code reference website – to educate the public, support scanner hobbyists, and provide a reliable source for understanding what’s happening behind the scenes in public safety.

While all the police code information on our website is provided at no cost, we do display advertisements to help cover our operating expenses. Your visits help keep this project alive and growing.

Whether you’re a scanner enthusiast, a journalist, a student researching public safety communications, or just someone who wants to better understand what you hear on a police scanner – we welcome you. Dive in and start exploring U.S. police codes, from 10-1 to 10-99 and beyond.

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