Code 20 has sharply different police meanings. CHP's card associates it with notifying the press; San Jose's guide describes emergency officer assistance; Atherton and Belmont describe cover from local units. In Tucson's list it identifies the Evidence, Property and Identification Center building.
Code 20 Meaning by Agency
Each row below is tied to an agency document. The large difference between them is the main finding: a definition from a neighboring department can be misleading even within the same state.
| Agency or list | What Code 20 means | Source |
|---|---|---|
| Tucson Police Department (AZ) | EPIC Building (Evidence, Property, and Identification Center) | Tucson PD radio codes |
| Atherton Police Department (CA) | Cover; local units only | Atherton PD dispatch manual |
| Belmont Police Department (CA) | Cover; local units only | Belmont PD dispatcher manual |
| California Highway Patrol (CA) | Notify press | CHP aural brevity card |
| Cotati Police Department (CA) | Officer needs help urgent | Cotati PD communications manual |
| Downey Police Department (CA) | Notify the news media | Downey PD communications manual |
| Los Angeles Police Department (CA) | Collision or event likely to stir public interest; sent with its location | LAPD Manual, Volume 4 |
| San Jose Police Department (CA) | Officer needs assistance - emergency | San Jose PD 10-code guide |
| Sebastopol Police Department (CA) | Emergency cover; local units only | Sebastopol PD dispatch manual |
| Colorado Springs Police Department (CO) | Emergency assistance request when clear speech would cause an undesirable reaction | Colorado Springs PD GO 1063 |
Cover or Emergency Assistance in Some Agencies
The Atherton and Belmont dispatch manuals describe cover from local units. Sebastopol describes emergency cover from local units. San Jose's study guide uses an emergency officer-assistance meaning, and Cotati's manual also describes urgent officer help.
These entries share an assistance theme, but they do not supply one combined response procedure. The number does not, by itself, establish what additional units do, who responds or why assistance was requested. The officer-help guide separates routine cover from an urgent help signal.
CHP and LAPD: Press or Public-Interest Context
CHP's aural brevity card associates Code 20 with notifying the press. Downey's manual uses a similar news-media meaning. LAPD Manual Volume 4 describes Code Twenty for an unusual or striking collision or event likely to attract public interest, transmitted with its location.
That creates a direct conflict with assistance definitions in other California manuals. An isolated Code 20 cannot be translated into “officer in distress” unless the relevant agency source supports it. Likewise, a media-related use does not mean every event called Code 20 resulted in a public release.
Tucson: A Building Rather than a Response
Tucson's published radio-code page uses Code 20 for the EPIC Building, expanded as Evidence, Property and Identification Center. Here the code identifies a facility. It is neither the press-notification meaning nor an emergency request.
A radio exchange about a location can therefore contain Code 20 without using 10-20. The surrounding words and the department help distinguish a place name from a question asking where a unit is.
Do Not Mix Code 20, 10-20 and Dallas Signal 20
10-20 is the familiar location code in the cited APCO and many agency lists. Dallas's published problem-type report separately lists signal 20 for robbery. These three labels share a number but belong to different code systems.
When a search result drops the prefix or omits the city, it can look as though one definition contradicts another. Keep the full form: Code 20, 10-20, or Dallas signal 20. The Texas guide and location guide explain those other two references.
How to Use This Comparison
Identify the agency, keep any additional words and check the document period. The listed manuals support the meanings shown; a publicly posted older manual does not establish every current dispatch habit. Use the scanner-code guide for the surrounding code families.
The main hub links to agency comparisons and legal references separately. That prevents a common number from being treated as a universal national definition.
FAQ
Does Code 20 mean officer needs help?
In some sources, including San Jose and Cotati, it concerns emergency assistance. CHP and other agencies use different meanings.
What is Code 20 in the CHP card?
The cited CHP card associates it with notifying the press.
Is Code 20 the same as 10-20?
No. The full label matters. 10-20 refers to location in many published lists.
What does Dallas 20 mean?
The cited Dallas problem-type report labels signal 20 as robbery. That is separate from Code 20 in the comparison table.
Why do online Code 20 meanings conflict?
The sources themselves differ. A useful definition must retain the agency and document context.
Sources
- Tucson Police Department Radio Codes, Tucson Police Department. Official Checked October 2026
- Dispatch Training Manual 2020, Atherton Police Department. Updated 2-2020. Official Checked October 2026
- Dispatcher Training Manual, Belmont Police Department. Updated June 21, 2019. Official Checked October 2026
- CHP 254 – Aural Brevity Card (01-2021 v2), California Highway Patrol. Official Checked October 2026
- Communications and Records Training Manual, Cotati Police Department. Official Checked October 2026
- Communications manual (radio codes), Downey Police Department. Official Checked October 2026
- LAPD Manual, Volume 4: Radio Codes, Los Angeles Police Department. Official Checked October 2026
- SJPD 10-Codes (study guide), San Jose Police Department. Updated 10/15/18. Official Checked October 2026
- Dispatch Training Manual, Sebastopol Police Department. Updated April 28, 2022. Official Checked October 2026
- General Order 1063 (radio communications), Colorado Springs Police Department. Updated 12/26/2024. Official Checked October 2026
- Calls Summary by Problem (Signal) Type, Dallas Police Department. Updated 10/23/2026. Official Checked October 2026