What is an MSAG?
MSAG stands for “Master Street Addressing Guide.” The MSAG is the heart of an Enhanced 9-1-1 (E9-1-1) system. It contains addressing, community and emergency response information for every road in the area it covers (often an entire county). If you call 9-1-1, your address and phone number are matched against the MSAG to extract the code for the specific law enforcement agency, fire district and ambulance service that serves your particular address.
