Police Scan Codes (APCO 10)

In order to more rapidly communicate over the radio, the police use special codes that were created by The Association of Public-Safety Communications Officials. Each district has a unique listing, but the standard lists can be found here. APCO 10 is the old standard. The Extended APCO is an attempt to make a more acceptable listing for the entire country.

APCO 10 Codes

10-1Cannot understand your message.
10-2Your message is understandable.
10-3Stop transmitting.
10-4Message received.
10-5Relay message to ______.
10-6Station is busy.
10-7Out of service.
10-8In service.
10-9Repeat last message.
10-11_____ in service.
10-12Stand by.
10-13Report _____ conditions.
10-15Message delivered.
10-16Reply to message.
10-17En route.
10-19Contact _____.
10-20Unit location.
10-21Telephone ______.
10-22Cancel last message.
10-23Arrived at scene.
10-24Assignment complete.
10-25Meet _____.
10-26Estimated time of arrival is _______.
10-27Request drivers license information.
10-28Request vehicle registration information.
10-29Check records.
10-30Use caution.
10-31Pick up _____.
10-32Units requested.
10-33Emergency! Clear the air.
10-34Correct time.


Extended APCO

10-0Use caution.
10-1Signal weak.
10-2Signal good.
10-3Stop transmitting.
10-4Message received.
10-6Station is busy.
10-7Out of service.
10-8In service.
10-10Fight in progress.
10-11Animal problem.
10-12Stand by.
10-13Report conditions.
10-14Prowler report.
10-15Civil disturbance.
10-16Domestic problem.
10-17Meet complainant.
10-19Go to station.
10-20Advise your location.
10-21Phone ______.
10-23Arrived at scene.
10-24Assignment complete.
10-25Report to _____.
10-26Detaining suspect.
10-27Driver's license information.
10-28Vehicle registration information.
10-29Check records for want.
10-30Unauthorized use of radio.
10-31Crime in progress.
10-32Person with a gun.
10-33Emergency-all units stand by.
10-35Major crime alert.
10-36Correct time.
10-37Suspicious vehicle.
10-38Stop suspicious vehicle.
10-39Respond with sirens and flashers.
10-40Do not use sirens and flashers.
10-41Beginning shift.
10-42End shift.
10-44Permission to leave.
10-45Dead animal.
10-46Assist motorist.
10-47Emergency road repair.
10-48Traffic control.
10-49Traffic signal out.
10-50Traffic accident.
10-51Request tow truck.
10-52Request ambulance.
10-53Roadway blocked.
10-54Livestock on roadway.
10-55Intoxicated driver.
10-56Intoxicated pedestrian.
10-57Hit and run accident.
10-58Direct traffic.
10-60Squad in vicinity.
10-61Personnel in vicinity.
10-62Reply to message.
10-63Prepare to copy.
10-64Local message.
10-65Net message.
10-66Cancel message.
10-67Clear for net message.
10-68Dispatch information.
10-69Message received.
10-70Fire alarm.
10-71Advise nature of alarm.
10-72Report progress of alarm.
10-73Smoke report.
10-75In contact with ______.
10-76En route to _____.
10-77Estimated time of arrival.
10-78Request assistance.
10-79Notify coroner.
10-80Pursuit in progress.
10-81Breathalyzer report.
10-82Reserve lodgings.
10-83School crossing assignment.
10-84Estimated time of arrival.
10-85Arrival delayed.
10-86Operator on duty.
10-87Pick up.
10-88Advise phone number.
10-89Bomb threat.
10-90Bank alarm.
10-91Pick up subject.
10-92Illegally parked vehicle.
10-94Drag racing.
10-95Subject in custody.
10-96Detain subject.
10-97Test signal.
10-98Prisoner escape.
10-99Wanted or stolen.


Monitoring police scanners can be an informative experience, but before you decide to take it up as your hobby, be sure you familiarize yourself with the local laws and regulations. For example, in Michigan it's illegal to use or possess a police scanner in an automobile. Otherwise, have fun.