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Police Ten Codes

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Discuss ten codes in our new Private Investigation Forum.

Ten-codes, or 10-codes, are codes used in two-way voice radio communication as numeric code words for frequently used messages. Ten-codes are used particularly by law enforcement and in Citizen's Band (CB) radio transmissions.  They originated in the United States law enforcement community before World War II.  The first set of 10-codes was published by the Association of Public-Safety Communications Officials in 1940. Ten codes were invented to help reduce use of speech on the radio. Use of the codes was expanded in 1974 by the Association of Public Safety Communication Officials (APCO), allow for brevity and standardization of message traffic.

There is no universal, official set of 10-codes, and the meanings of a particular 10-code can vary between one jurisdiction and another.  While "ten codes" were intended to be a concise, and standardized system, the proliferation of different meanings has rendered it useless for situations where people from different agencies and jurisdictions need to communicate. In the fall of 2005, the United States Federal Emergency Management Agency (FEMA) discouraged the use of ten-codes and other codes due to their high variability in meaning. The Department of Homeland Security reportedly has plans to do away with 10-codes as well.

Some organizations and municipalities also use other codes in addition to the ten-codes. An example is the California Highway Patrol's use of eleven-codes, and the Port Authority Police use of eight codes.

Amateur radio hams do not use ten-codes.  Instead they use Q codes, which are derived from Morse code. Ten codes are highly discouraged in amateur radio use, though they are sometimes used by novice operators.


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Following is a list of police ten codes:

  • 10-1 poor reception
  • 10-2 good reception
  • 10-3 stop transmitting
  • 10-4 message received, affirmative, ok
  • 10-5 relay this information to ___.
  • 10-6 busy
  • 10-7 out of service
  • 10-8 in service
  • 10-9 please repeat your message
  • 10-10 negative
  • 10-12 standby
  • 10-13 civilians present and listening
  • 10-15 en route to station with suspect
  • 10-18 urgent
  • 10-19 return to station
  • 10-20 specify location/my location is ___.
  • 10-21 place a phone call to ___.
  • 10-22 disregard
  • 10-23 stand by on this frequency (also "On scene" in some areas)
  • 10-27 vehicle registration request
  • 10-28 arrests/warrants on driver's license
  • 10-29 arrests/ warrants on the vehicle
  • 10-32 gun
  • 10-33 emergency traffic follows, hold routine messages
  • 10-34 frequency open (cancels 10-33)
  • 10-36 what is the correct time of day?
  • 10-39 false alarm, premises was occupied
  • 10-40 false alarm, no activity, premises appears secure
  • 10-41 begin watch
  • 10-42 end watch
  • 10-45 fueling vehicle

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  • 10-49 en route to assignment
  • 10-50 accident
  • 10-51 tow truck needed
  • 10-52 ambulance needed
  • 10-53 road blocked at ___.
  • 10-54 animals on highway
  • 10-55 security check
  • 10-57 hit-and-run accident
  • 10-58 direct traffic
  • 10-59 escort
  • 10-60 squad in vicinity, lock-out
  • 10-61 personnel in area
  • 10-62 reply to message
  • 10-63 clear to copy info?
  • 10-64 message for delivery
  • 10-65 net message assignment
  • 10-66 net message cancellation
  • 10-67 person calling for help
  • 10-68 dispatch message
  • 10-69 message received
  • 10-70 prowler, fire alarm
  • 10-71 gun involved, advise nature of fire
  • 10-72 shooting, fire progress report
  • 10-73 smoke report
  • 10-74 negative
  • 10-75 in contact with ___.
  • 10-76 en route
  • 10-77 ETA ___.
  • 10-78 need assistance
  • 10-79 bomb threat, coroner's case
  • 10-80 bomb has exploded
  • 10-81 breathalyzer report
  • 10-82 reserve lodging
  • 10-83 work school crossing at ___.
  • 10-84 if meeting ___, advise ETA
  • 10-85 delay due to ___.
  • 10-86 officer on-duty
  • 10-87 pickup
  • 10-88 present phone number of ___.
  • 10-89 bomb threat
  • 10-90 bank alarm at ___.
  • 10-91 pick up prisoner
  • 10-92 improperly parked vehicle
  • 10-93 blockage
  • 10-94 drag racing
  • 10-95 prisoner/subject in custody
  • 10-96 psych patient
  • 10-97 check signal ("On Scene" in CA and other areas)
  • 10-98 prison/jail break
  • 10-99 wanted/stolen record
  • 10-100 dead body
  • 10-200 alarm

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