The Most Common Police 10 Codes

The Most Common
Police 10 Codes

Contents
-- Introduction
-- 10 Code List
-- Police Scanners

Introduction
Ten (10) codes are used to communicate efficiently for radio transmissions. The word ten (10) indicates the next number, or numbers, is a code message. The codes are used extensively by police, fire, medical (ground, air, and hospitals), public services, businesses (taxi's etc) and individuals (Citizen Band radio, walkie-talkies).

There are six code messages (universal) used by most code versions.

UNIVERSAL 10 CODE MESSAGES

10-4	--	Acknowledge
10-7	--	Out of Service (lunch etc)
10-8	--	In Service
10-20	--	Location
10-21	--	Call __ by Phone
10-28	--	Vehicle Identification

The Most Common 10 Code Versions
Law Enforcement use one of several 10 code versions. The code version an agency uses depends on the region. The APCO (Association of Police Communications Officers) is the most widely used 10 code version.

POLICE CODES
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APCO

APCO-v0

Norfolk, VA

Walnut Creek, CA

10 CODES

Code	APCO	APCO-v0	Norfolk, VA	Walnut Creek, CA
10-1	Unable to Copy - Change Location	Signal Weak	Police Officer Needs Help	Poor Radio Reception
10-2	Signal Good	Signal Good	Assist Officer	Good Radio Reception
10-3	Stop Transmitting	Stop Transmitting	Clear the Air-Emergency	Stop Transmission
10-4	Acknowledgment (OK)	Affirmative (OK)	O.K., Acknowledgment	Message Received
10-5	Relay	Relay To / From	See a Complainant	Relay Message
10-6	Busy - Unless Urgent	Busy	Investigation Police or Fire	Change Radio Channel
10-7	Out of Service	Out of Service	(a) Out of Service - Off the Air (b) Out of Service - Subject to Call	Out of Service
10-8	In Service	In Service	In Service	In Service
10-9	Repeat	Say Again	Arrived at Scene	Repeat Message
	APCO	APCO-v0	Norfolk, VA	Walnut Creek, CA
10-10	Fight In Progress	Negative	Traffic Detail	Off Duty
10-11	Dog Case	___ on Duty (Employee Number)	Broken Glass	Visitors Can Hear Radio
10-12	Stand By (Stop)	Stand By (Stop)	Vandalism	Advise Weather / Road Conditions
10-13	Weather-Road Report	Weather Conditions	(a) Leaking Water Main or Sewer (b) Hole in the Street / Sidewalk
10-14	Prowler Report	Message / Information	Convoy or Escort
10-15	Civil Disturbance	Message Delivered	Have Prisoner in Custody	Have Prisoner in Custody
10-16	Domestic Problem	Reply to Message	Pick Up Prisoner	Pick Up
10-17	Meet Complainant	Enroute	Administrative Assistance	Getting Fuel
10-18	Quickly	Urgent	Detail
10-19	Return to ___	(In) Contact	Return to Station	Return or Go to ___
	APCO	APCO-v0	Norfolk, VA	Walnut Creek, CA
10-20	Location	Location	What is Your Location	Location
10-21	Call ___ by Phone	Call ___ by Phone	Call ___ by Telephone	Telephone
10-22	Disregard	Disregard	Investigate a Break In	Cancel or Disregard
10-23	Arrived at Scene	Arrived at Scene	Breaking In (In Progress)	Stand By
10-24	Assignment Completed	Assignment Completed	Someone in the Building
10-25	Report in Person (Meet)	Report to (Meet)	Prowler	Do You Have Contact With ___ ?
10-26	Detaining Subject, Expedite	Estimated Arrival Time (ETA)	Larceny	Clear of Warrants
10-27	(Drivers) License Information	License / Permit Information	Rape Report	Subject Wanted
10-28	Vehicle Registration Information	Vehicle Information	Check Full Registration, License, Motor, Name, Stolen	Registration Check
10-29	Check for Wanted	Records Check	Person with a Gun	Check for Warrants
	APCO	APCO-v0	Norfolk, VA	Walnut Creek, CA
10-30	Unnecessary Use of Radio	Danger / Caution	(a) Vehicle Accident (b) Vehicle Accident Personal Injury (c) Hit and Run
10-31	Crime in Progress	Pick Up	Hold Up and Robbery
10-32	Man with Gun	___ Units Needed (Specify)	Defective Traffic Light
10-33	Emergency	Need Immediate Assistance	Execute Warrant	Alarm is Sounding
10-34	Riot	Current Time	Narcotics Investigation
10-35	Major Crime Alert		Get a Stolen Auto Report	Time Check
10-36	Correct Time		Correct Time	Correct Time
10-37	(Investigate) Suspicious Vehicle		Finished With Last Assignment	Please Identify Your Unit
10-38	Stopping Suspicious Vehicle		(a) Reckless Driving (b) Drunk Driver
10-39	Urgent - Use Light, Siren		Report of a Dead Person	Can ___ Come to Radio?
	APCO	APCO-v0	Norfolk, VA	Walnut Creek, CA
10-40	Silent Run - No Light, Siren	Fight in Progress	Suspicious Person-Auto	Is ___ Available for Phone Call?
10-41	Beginning Tour of Duty	Beginning Tour of Duty	(a) Lost Child (b) Investigate Runaway
10-42	Ending Tour of Duty	Ending Tour of Duty	Car Improperly Parked
10-43	Information	In Pursuit	Drunk
10-44	Permission to Leave ___ for ___	Riot	Disturbance (type)
10-45	Animal Carcass at ___	Bomb Threat	Fight	Subject Condition: A to D
10-46	Assist Motorist	Bank Alarm	Attempted Suicide
10-47	Emergency Road Repair at ___	Complete Assignment Quickly	(a) Injured (b) Sick (c) Demented Person (d) Maternity Case
10-48	Traffic Standard Repair at ___	Detaining Suspect, Expedite	Person Overboard
10-49	Traffic Light Out at ___	Drag Racing	Barking Dog	Proceeding to ___
	APCO	APCO-v0	Norfolk, VA	Walnut Creek, CA
10-50	Accident: F - Fire, PI - Personal Injury, PD - Property Damage.	Vehicle Accident: F - Fire, PI - Personal Injury, PD - Property Damage.	Court Cases	Drugged
10-51	Tow Truck Needed	Dispatch Tow Truck	General Message	Drunk
10-52	Ambulance Needed	Dispatch Ambulance	Open Door / Window(state Which)	Ambulance Needed
10-53	Road Blocked at ___	Road Blocked	Gas-Repairs-Wash	Person Down
10-54	Livestock on Highway	Hit and Run Accident: F - Fire, PI - Personal Injury, PD - Property Damage.	Man Molesting Children	Possible Body
10-55	Intoxicated Driver	Intoxicated Driver	Bomb Threat	Coroner's Case
10-56	Intoxicated Pedestrian	Intoxicated Pedestrian	Unruly Crowd	Suicide (a) - Attempted
10-57	Hit and Run: F - Fire, PI - Personal Injury, PD- Property Damage.	Request BT Operator	Tampering With Automobile
10-58	Direct Traffic	Direct Traffic	Burglar Alarm
10-59	Convoy or Escort	Escort	Traffic Violator	Security Check
	APCO	APCO-v0	Norfolk, VA	Walnut Creek, CA
10-60	Squad in Vicinity	Suspicious Vehicle	(a) Dead Dog (b) Live Dog (c) Stray Dog (d) Dog Bite
10-61	Personnel in Area	Stopping Suspicious Vehicle	Void IBM Card	Bike Theft
10-62	Reply to Message	B and E in Progress (Breaking & Entering)	Radio Test
10-63	Prepare to Make Written Copy	Prepare to Receive an Assignment	Personal Relief	Prepare to Copy
10-64	Message for Local Delivery	Crime in Progress	Eating (state Location)
10-65	Net Message Assignment	Armed Robbery	Exposure
10-66	Message Cancellation	Notify Medical Examiner	Send Tow Truck to (a) Owner Request (b) Police Request	Suspicious Person
10-67	Clear for Net Message	Report of Death	Smoke and Flames Visible	Person Calling for Help
10-68	Dispatch Information	Livestock in Roadway	In Commission on Stand-By
10-69	Message Received	Advise Telephone Number	Held Up By Bridge or Train
	APCO	APCO-v0	Norfolk, VA	Walnut Creek, CA
10-70	Fire Alarm	Improper Parked Vehicle	Danger / Caution	Prowler
10-71	Advise Nature of Fire	Improper Use of Radio	False Alarm	Shots Fired
10-72	Report Progress on Fire	Prisoner in Custody	Person Found in Burning Building
10-73	Smoke Report	Mental Subject	Existing Conditions	How Do You Copy?
10-74	Negative	Prison / Jail Break	Enroute
10-75	In Contact with ___	Wanted or Stolen	Dispatch Mechanic
10-76	En Route ___	Prowler	Rewind Box (Give Location)
10-77	ETA (Estimated Time of Arrival)	Direct Traffic at Fire Scene	Send VEPCO (state Gas or Electric), (b) send C & P (phone)
10-78	Need Assistance		Held Up by (state)
10-79	Notify Coroner		Courtesy Call
	APCO	APCO-v0	Norfolk, VA	Walnut Creek, CA
10-80	Chase in Progress	Fire Alarm	Critical Call (Code Red)	Explosion
10-81	Breatherlizer Report	Nature of Fire	Fire Alarm
10-82	Reserve Lodging	Fire in Progress	Additional Engine Co.
10-83	Work School Crossing at ___	Smoke Visible	Additional Ladder Co.
10-84	If Meeting ___, Advise ETA (Estimated Time of Arrival)	No Smoke Visible	Second Alarm
10-85	Delay due to ___	Respond without Blue Lights / Siren	Third Alarm
10-86	Officer / Operator on Duty		Person Trapped	Any Traffic for Me?
10-87	Pickup / Distribute Checks		Auto Fire
10-88	Present Telephone # of ___		Request Deputy Chief	Provide Cover for Units
10-89	Bomb Threat		Request Additional Chief
	APCO	APCO-v0	Norfolk, VA	Walnut Creek, CA
10-90	Bank Alarm at ___		Transfer Fire Alarm Wire
10-91	Pick Up Prisoner / Subject		Check Fire Alarm Box or Master Box	Hazard
10-92	Improperly Parked Vehicle		Fire Alarm Circuit Open or Trouble on Circuit
10-93	Blockade		Fire Alarm
10-94	Drag Racing		Request Gas or Diesel Fuel
10-95	Prisoner / Subject in Custody		Grass or Trash Fire
10-96	Mental Subject		In Quarters
10-97	Check (Test) Signal		Signal Weak	Arrived at Scene
10-98	Prison / Jail Break		Signal Good	Completed Assignment
10-99	Wanted / Stolen Indicated		Fireman Need Help
	APCO	APCO-v0	Norfolk, VA	Walnut Creek, CA
10-100		Dead Body Found
10-101	What is Status? (Are you secure?)	What is Status? (Are you secure?)
10-106	Secure (Status is secure)	Secure (Status is secure)
Print Version	Download APCO	Download APCO-v0	Download Norfolk, VA	Download Walnt Creek, CA
Print Version	Download Above Table (PDF).

Police Radios
Many agencies, especially larger departments, use encrypted digital radios to prevent the public from listening. Some agencies use an analog or digital trunk system, similar to analog and digital cell phone systems. A scanner programmed for that trunk system is required. A basic scanner will receive analog radios, which go back to the last century and still have wide use. Many areas have a mix of systems.

Basic Scanner

Basic police scanners will receive radio transmissions that use Narrow Band Frequency Modulation (NBFM) in 3 different frequency bands (Low, Mid, High). The Low and Mid bands are in part of the Very High Frequency (VHF) band. The scanner High band has a small part of the Ultra High Frequency (UHF) band. Many scanners also pick up Aircraft Amplitude Modulated (AM) radios in the VHF band. Some scanners can receive amplitude modulated (AM) citizens band (CB) radios in the High Frequency (HF) band.

Low Band ( 29 - 54 MHz )
This band is considered shortwave radio and has longer range than higher frequencies. Police and government public services are allocated the frequencies from 30-50 MHz. Amateur radio (HAM) uses 50-54 MHz (10 meter wavelength), and 29.0-29.7 MHz (6 meter). The HAM 6 meter band can use NBFM, AM (amplitude modulation), or SSB (single side band) modulation. Basic scanners only get the NBFM signals. Citizens Band (CB) radios operate from 26.965 to 27.405 MHz, and use AM. Some scanners can receive CB signals.

FM Radio and Aircraft ( 88 - 137 MHz )
Some scanners get FM broadcast (88 - 108 MHz). Many scanners get Aircraft radios 108-137 MHz (AM).

Mid Band ( 137 - 174 MHz )
Government fixed and mobile radios are allocated 137-144 MHz. HAM 2 meter radio is allocate 144-148 MHz. Many regional and inter-agency police radios, state and county police, and fire, ambulance (ground and air), hospitals and business's have frequencies in the 148 - 156 MHz band. Marine (ship to ship, ship to shore, waterway traffic, locks, port, and dock operations, and the US Coast Guard) are on frequencies between 156--157.5 MHz. Railroads (operations, Amtrak police, walkie-talkies) have 97 channels (frequencies) between 159.8-157.5 MHz. The National Weather Service (NWS) has 7 channels between 162.4-162.5 MHz that broadcast forecast. The frequencies between 164-174 MHz are licensed for public use.

Marine Channel Frequencies

High Band ( 380 - 512 MHz )
Aircraft and airport operations use 380-410 MHz. Government mobile radio (Federal and state) use 410-440 MHz. HAM 70 centimeter radio uses 440-450 MHz. The public (includes walkie-talkies) and government (some police departments) have channels between 450-470 MHz. Some older government truck radios use 470-512 MHz. These frequencies are primarily used by broadcast television RF (Radio Frequency) channels 14-20.

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