What is 415?

415 is the area code for San Francisco, California, and some nearby communities. The area code was first introduced in 1947 as one of the original area codes in the North American Numbering Plan. In addition to San Francisco, the 415 area code also includes parts of Marin and San Mateo counties. The 415 area code is one of the most densely populated in the United States, with a population of over 2.5 million people. It is also known for being the location of numerous famous landmarks, including the Golden Gate Bridge, Alcatraz Island, and Fisherman's Wharf.