National 311 Day is observed every March 11 in the United States and Canada to promote awareness of the 311 non-emergency telephone number, which connects residents to various municipal services. The service was first launched in Baltimore, Maryland in 1996 as a police non-emergency number and became more comprehensive with the City of Chicago's implementation in 1999. Many major cities and some smaller towns across the U.S. and Canada, including Calgary, which introduced 311 in 2005, have adopted this system. The day honors the operators who assist residents with non-emergency issues such as reporting graffiti, lost pets, and noise complaints. In 2020, Google employees contributed to the establishment of National 311 Day while working on improving response times in San José, California. Observers are encouraged to learn about their local 311 services, use them when needed, and express gratitude to 311 operators.