You Are Listening to Los Angeles is a website that does an unusual mash-up– police scanner plus ambient music. It’s oddly hypnotic and while most of the time nothing is really happening, every once in awhile you’ll hear something interesting occur. If you need to brush up on your police codes, here’s a handy guide to LA County Sheriff Codes and LAPD Scanner Codes:

Los Angeles PD Radio Signal Codes

from PoliceScanner.com

15A48 

The Unit Number consists of three parts, where the first part is the
division number, the second part is the type of unit, and the third part is
the master beat or special unit number.  Therefore, the above unit is a 15th
division (North Hollywood) 2 man patrol vehicle assigned to master beat 48.  

DIVISION NUMBER

 1 	CENTRAL     
 2	RAMPART
 3 	SOUTHWEST  
 4 	HOLLENBECK 
 5 	HARBOR          
 6 	HOLLYWOOD  
 7 	WILSHIRE              
 8 	WEST LOS ANGELES                      
 9 	VAN NUYS           
10 	WEST VALLEY  
11 	NORTHEAST      
12 	77TH STREET   
13 	NEWTON STREET       
14 	PACIFIC                     
15 	NORTH HOLLYWOOD  
16 	FOOTHILL                   
17 	DEVONSHIRE
18 	SOUTHEAST
24 	CENTRAL TRAFFIC
25 	SOUTH TRAFFIC
34 	WEST TRAFFIC
35 	VALLEY TRAFFIC	

TYPE OF UNIT

A 	TWO MAN PATROL VEHICLE                
B 	TWO MAN PATROL VAN
C 	PARKING ENFORCEMENT
CL 	BICYCLE PATROL
CRASH	COMMUNITY RESOURCES AGAINST STREET HOODLUMS (Anti-Gang) 
DV 	DOMESTIC VIOLENCE
E 	TRAFFIC ENFORCMENT
F 	FELONY ENFORCEMENT
FB 	UNIFORMED FOOT PATROL (FOOT BEAT)
H 	DIVISIONAL HOMICIDE
IBARS 	FIELD BOOKING
J 	JUVENILE INVESTIGATOR                            
JW 	JUVENILE INVESTIGATOR (FEMALE)
L 	ONE MAN PATROL VEHICLE
M 	MOTORCYCLE UNIT
MQ 	SPECIAL MOTORCYLE UNIT  
MX 	DUI PATROL UNIT             
OP 	OBSERVATION POST
P 	SPECIAL DETAIL/EVENTS SUPERVISOR
Q 	SPECIAL DETAIL/EVENTS UNIT 
T 	TRAFFIC INVESTIGATOR
TL      TRAFFIC INVESTIGATOR SUPERVISOR
U 	REPORT TAKING UNIT
UC 	UCLA POLICE
V 	DIVISIONAL VICE INVESTIGATOR  
VS 	VISITOR SERVICES
W 	DIVISONAL DETECTIVES
X 	EXTRA PATROL UNIT
Z 	SPECIAL PATROL UNIT (RESERVES)  

THE LAST POSITION INDICATES THE MASTER BEAT OR SPECIAL UNIT NUMBER
(SOME UNITS THAT HAVE THE LAST DIGIT OF 0 ARE SPECIAL UNITS) 

10 	WATCH COMMANDER                                              
20-70 	FIELD SUPERVISOR 
80 	COMMUNITY RELATIONS
90 	STATION DESK

CITYWIDE UNITS

SUPPORT SERVICES ("DAVID" UNITS):

1D  	FIELD SUPPORT SERVICES
2D  	AIRCRAFT SUPPORT SERVICES
3D      TACTICAL PLANNING

ADMINISTRATIVE SERVICES ("HENRY" UNITS): 

1H  	DETENTIONS/JAIL                              
2H  	SCIENTIFIC INVESTIGATIONS
2H2     BOMB SQUAD
2H90    CRIME LAB
2H90B   PHOTO LAB
2H90C   LATENT PRINTS                               
3H  	ADVANCE PALNNING                         
4H  	MOTOR TRANSPORTATION                  
5H  	PERSONNEL                               
6H  	MANAGEMENT SERVICES  
8H  	FISCAL SERVICES
9H  	PROPERTY MANAGEMENT  
10H 	COMMUNICATIONS 
12H 	RECORDS & IDENTIFICATION
13H 	SUPPLIES
14H 	TRAINING 

INVESTIGATIVE SERVICES ("KING" UNITS):

1K      INVESTIGATIVE SERVICES HEADQUARTERS
2K 	BURGARY/AUTO THEFTS  
3K 	BUNCO/FORGERY 
4K 	ROBBERY/HOMICIDE
5K      DETECTIVE SUPPORT SECTION
5K90    SPECIAL INVESTIGATIVE SECTION
5K90C   CRIMINAL CONSPIRACY SECTION
5K90G   GANG SECTION
5K90F   FUGITIVE SECTION

METROPOLITAN (METRO) DIVISION ("ROBERT" UNITS):

R plus Unit Number plus:

A       ADMINISTRATIVE PLATOON
B       VALLEY PLATOON
C       METRO AREA PLATOON
D       SPECIAL WEAPONS AND TACTICS (SWAT) TEAM
E       EQUESTRIAN UNIT
G       METRO ANTI-GANG TASK FORCE ? 

SPECIAL SERVICES ("Y" UNITS)

2Y      INTERNAL AFFAIRS 
4Y      ORGANIZED CRIME INTELLIGENCE
5Y      ANTI-TERRORIST UNIT
6Y      VICE ADMINISTRATION    
7Y	NARCOTICS - TASK FORCE AND SPECIAL UNITS 
8Y	NARCOTICS - FIELD ENFORCEMENT
9Y 	NARCOTICS - MAJOR and MID-LEVEL ENFORCEMENT

LOS ANGELES POLICE DEPARTMENT CODES

RADIO CODES

Code 1          Acknowledge Call/Respond Over Radio
Code 2          Routine Call, No Lights or Siren
Code 2-HIGH     Priority Call, No Lights or Siren 
Code 3          Emergency Call, Lights and Siren 
Code 4          No Further Assistance Needed
Code 5          Stakeout - Stay Away
Code 6          Out of Car on Investigation
Code 6A         Out of Car on Investigation, Requires Assistance    
Code 6C         Out of Car on Investigation, Suspect is Wanted
Code 6G         Out of Car on Investigation, Gang Activity        
Code 7          Meal Break
Code 8          Fire Alarm
Code 8A         Working Fire
Code 10         Request to Clear Frequency for Crime Broadcast
Code 12         False Alarm
Code 20         Notify Media
Code 30         Burglar Alarm (Code 30 Ringer or Code 30 Silent)
Code 37         Vehicle is Reported Stolen
Code 77         Caution, Possible Ambush
Code 99         Emergency
Code 100        In Position to Intercept

COMMONLY USED PENAL CODES USED AS RADIO CODES

148             Resisting Arrest
187             Homicide
207             Kidnapping
211             Armed Robbery
211 SILENT      Silent Holdup Alarm
240             Assault
242             Battery
245             Assault With Deadly Weapon
246             Shooting in Dwelling
261             Rape
288             Lewd Conduct
311             Indecent Exposure 
374             Illegal Dumping
390             Intoxicated Person
415             Disturbance
417             Person With a Gun
451             Arson
459             Burglary
470             Forgery
480             Hit and Run
484             Theft
487             Grand Theft
488             Petty Theft
502             Driving Under the Influence (DUI) 

CALIFORNIA STANDARD 10-CODES

10-10           Out of Service
10-11           Talk Slower
10-12           Visitors Present
10-14           Escort
10-15           Enroute With Prisoner
10-16           Pick Up Prisoner
10-17           Pick Up Document
10-23           Stand-By
10-24           Trouble at Station
10-27           Check Driver's License
10-34           Resume Normal Broadcast
10-35           Confidential Information
10-36           Correct Time
10-37           Name of Operator
10-39           Message Delivered
10-86           Traffic Check
10-97           Arriving On Scene
10-98           Assignment Complete
10-99           Emergency

OTHER TERMINOLOGY

AC              Aircraft Crash
BT              Bomb Threat
PR              Person Reporting (Complaintant)
RD              Reporting District (Division plus Master Beat)
TC              Traffic Collision

LOS ANGELES COUNTY SHERIFF OFFICIAL CODES:
187 Murder 261 Rape Vicinity
207 Kidnapping 261-A Attempt Neglect
207-A Attempt Kidnapping 273-A Child Neglect
211 Robbery 273-D Wife Beating-Felony
211-S Robbery Alarm-Silent 288 Sex Crimes Against Children
217 Assault-Murder Intent 314 Indecent Exposure
220 Assault-Rape Intent 330 Gambling
242 Battery 374-B Illegal Dumping
245 Assault W/Deadly WPN. 390 Drunk
246 Shooting At Dwelling 390-F Drunk, Possible PCP Use
415 Disturbance 459-A Burglar Alarm-Audible
415-A Disturbance In Auto 459-S Burglar Alarm-Silent
415-B Disturbance- Business 470 Forgery
415-C Disturbance- Party Crash 480 Hit & Run- Felony
415-D Disturbance- Drunk 481 Hit & Run- Misdemeanor
415-E Disturbance- Party 483 Hit & Run- Parked Vehicle
415-F Disturbance- Family 487 Theft- Grand
415-G Disturbance- Gang Fight 487.2 Purse Snatch
415-J Disturbance- Juveniles 488 Theft- Petty
415-S Disturbance- Neighbors 488-B Theft- Bicycle
417 Man With Gun 502 Drunk Driving- Misd.
417-A Man With Knife 503 Auto Theft
417-S Barricaded Suspect 503-A Recovered Vehicle
447 Arson 504 Tampering With Auto
459 Burglary 504-A Car Strippers
510 Speeding Or Racing 902-A Attempt Suicide
586 Illegal Parking 902-H Enroute To Hospital
586-E Parking-Block Driveway 902-N Traffic Accident-No Inj.
594 Malicious Mischief 902-R Rescue Responding
597 Cruelty To Animals 902-T Traffic Accident-No Details
601 Incorrigible 903 Airplane Accident-No Details
602 Trespassing 903-L Low Flying Aircraft
604 Throwing Missiles 904 Fire
647 Vagrant 904-A Fire-Auto
647-A Vargrant Loitering Near 904-B Fire-Brush Or Grass
School Or Public Place 904-G Smoke Investigation
653-M Lewd Or Threatening TX 904-I Illegal Fire
901-N Ambulance Needed 904-S Structural Fire
901-S Ambulance Disp.-Inj. 904-T Fire-Trash
901-T Ambulance Disp.-Traffic 905-B Animal Bites
902 Person Sick Or Injured 905-D Dead Animal
905-N Noisy Animal 916-C Citizen Holding Felony Subj.
905-S Stray Animal 917-A Abandoned Auto
905-T Vicious Animal 917-S Suspicious Auto
909-A Hot Wires Down 918 Insane Person
909-T Traffic Hazard 919 Keep The Peace
911-A Contact Informant 920 Missing Adult
911-B Contact Officer 920-A Found Adult
911-C Contact Citizen 920-C Missing Child
911-N Do Not Contact Inform. 920-F Found Child
912 Are We Clear? 921 Prowler
913 Are You Clear? 921-P Peeping Tom
914-N Concerned Party Notify 922 Illegal Peddling
916 Officer W/Mids. Subject 923 Illegal Shooting
916-A Officer W/Felony Subject 924 Station Detail
916-B Citizen W/Misd. Subject 928-B Found Prop-Bicycle
924-B Notify Dispatcher 928-L Lost Property
925 Person Acting Suspic. 929 Person Down
925-A Person Susp. In Auto 929-A Person Down In Auto
926 Tow Truck Needed 930 See The Man
926-A Tow Truck Dispatched 930-A See The Manager
927 Suspicious Circumstance 931 See The Woman
927-A Susp. Circumstance Person 995 Strike Trouble
Pulled From TX 996 Explosion- Non Criminal
927-B Susp. Circumstance Open 996-B Bomb Explosion
Door Or Window 996-T Bomb Threat
927-C Check Vicinity 997 Officer Needs Help Urgently
927-D Susp. Circumstances Women District Cars Only (five units
Screaming with shortest ETA to respond)
998 Officer Request Assistance,
Involved In Shooting
999 Officer Needs Help Urgently