Area code 415 is one of the original 86 area codes established in 1947 and today serves San Francisco, Marin County, and parts of northern San Mateo County. Once covering all of Northern California, 415 has been trimmed down multiple times due to population growth, spawning area codes like 408, 510, and 650. In 2015, 628 was added as an overlay to prevent number exhaustion in the 415 region. Despite these changes, 415 remains closely tied to San Francisco’s identity, often used as a cultural shorthand for the city in tech circles, social media, and local slang. The area code is home to major tech companies, landmarks like the Golden Gate Bridge, and a thriving start-up ecosystem. It carries strong brand recognition in both business and pop culture, often representing sophistication, innovation, and urban lifestyle in Northern California.