The 11 code, similar to the APCO 10 code is a system of numeric codes devised by the California Highway Patrol to communicate situations unique or frequent to the work of the CHP.

It is also used in conjunction with the ten-code and other voice radio protocols. Other agencies also use it or have adapted it to better suit their specific area.

Disclaimer: The list is intended to show the most common codes and help provide an estimate of the code's definition. These codes can vary between Cities, Counties and States, therefore we can not guarantee their accuracy.