Find any 415- phone number in California
The 415 area code is a phone number prefix assigned to the San Francisco Bay area in California, United States. It is one of the three original area codes created in 1947 when the North American Numbering Plan was created, along with 213 and 916. The 415 area code includes the entire San Francisco metropolitan area and the counties of Marin, Napa, Sonoma, San Mateo, and San Francisco.
The North American Numbering Plan is an international system of telephone numbering used in the United States and Canada. It partitions the country into regions with numbers which are assigned to each region. The first 3 digits of a phone number represent the area code, and the next three digits identify the telephone exchange. The last 4 digits represent the users telephone line number within the exchange. The North American Number Plan allows for efficient routing of calls between geographical regions.