Contents Illinois State Police Codes Chicago Police Department Codes Chicago Taxi Codes Chicago Transit Authority Ten Codes Cook County Sheriff's Department Codes Dupage County Police Codes …

Information is from the "Scanner Master Chicagoland Pocket Guide", edited by Richard A. I. Carlson and Ted Moran.

The police version of ten-codes is officially known as the APCO Project 14 Aural Brevity Code.[1] The codes, developed during 1937–1940 and expanded in 1974 by the Association of Public-Safety …

Jul 9, 2023 · Discover the world of police ten codes in Illinois with this comprehensive guide. Learn about their history, meanings, usage, and their role in modern law enforcement.

Study with Quizlet and memorize flashcards containing terms like 10-1, 10-2, 10-4 and more.

Mar 12, 2025 · And while some departments are beginning to favor plain English over 10 codes, it’s still an important language to learn. Below is a fully comprehensive list of the Association of Public …

Dec 30, 2025 · Complete guide to police 10 codes and radio signals. Learn what 10-4, 10-20, and 100+ other law enforcement codes mean. Free printable list included.

Ten-codes, also known as 10-codes or ten signals, are code words used by many police officers to aid with voice communication. The codes were originally developed in 1937 to allow for brevity, clarity, …

Nov 1, 2024 · The APCO Association of Police Communications Officers has established a set of standardized 10 codes for use by police departments, including those in Illinois․

10 Codes - APCO Association of Police Communications Officers ... CopRadar.com/tencodes