Mill Valley, California
Pacific Time Zone (UTC-8) · CA · —
About Area Codes in Mill Valley, California
Mill Valley, California is served by 2 area codes: 415, 628. When multiple area codes serve the same geographic area, it typically indicates overlay codes have been added to accommodate growing demand for phone numbers. All local calls within Mill Valley require 10-digit dialing. The city is in the Pacific time zone (UTC-8).
Other cities in area code 415
Frequently Asked Questions
What area code is Mill Valley, California?
Mill Valley, California uses area codes 415 and 628.
What time zone is Mill Valley in?
Mill Valley is in the Pacific time zone (UTC-8).
Do I need to dial 10 digits when calling Mill Valley?
Yes, all local calls in Mill Valley require 10-digit dialing because the area is served by multiple overlay area codes.
When was area code 415 created?
Area code 415 is one of the original 86 area codes established in 1947 as part of the North American Numbering Plan (NANP).
What cities share area code 415 with Mill Valley?
Other cities sharing area code 415 with Mill Valley include Corte Madera, Fairfax, Larkspur, Novato, San Anselmo, among others.
Mill Valley, CA · Pacific Time Zone