Ever wondered what those numbers mean that you hear over a police scanner, tv show or even in person? Well every combination has a different meaning. These codes were created to streamline communication over radio, even with a poor signal. It is much easier to understand a couple of numbers with static than several words.

Chances are you have heard, or even used the code 10-4, which simple means received or acknowledged. Well there are hundreds of other codes out there. Curious what they mean?

While these aren’t officially standardized by any agency and can vary from state to state or even county to county, there is a lot of overlap.

911codes.com has compiled a database of the most commonly used codes.

Popular 10 Codes

  • 10-29 : Request arrests/warrants check
  • 10-0 : Use caution
  • 10-28 : Check registration on vehicle
  • 10-57 : Hit and run accident / Missing person
  • 10-78 : Need assistance / Send ambulance
  • 10-108 : Officer down / Officer in danger
  • 10-99 : Cardiac arrest / Officer held hostage
  • 10-33 : Emergency, all units stand by
  • 10-84 : Advise ETA
  • 10-69 : Clear to copy transmission?

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