Area Code 415
California
Geographic Coverage
State
CA
Major Cities
- San Francisco
- South San Francisco
- San Rafael
- Novato
- Mill Valley
- Larkspur
- San Anselmo
- Tamalpais-Homestead Valley
- Corte Madera
- Tiburon
- Fairfax
- Sausalito
- Kentfield
- Lucas Valley-Marinwood
- Brisbane
- Santa Venetia
- Sleepy Hollow
- Ross
- Belvedere
- Lagunitas-Forest Knolls
- Woodacre
- Black Point-Green Point
- Inverness
- Bolinas
and 9 more cities
Time Zone
- Pacific Time (PT)
Current Time
Demographics & Economics
- Total Population
- 1,157,348
- Population Density
- 1,944 people/sq miabove U.S. average (U.S.: 94 people/sq mi)
- Median Household Income
- $141,446above U.S. median (U.S.: $78,538)
- Poverty Rate
- 9.8%below U.S. average (U.S.: 12.4%)
- Unemployment Rate
- 5.7%near U.S. average (U.S.: 5.2%)
- Education Attainment
- Bachelor's Degree+59.9%above U.S. average (U.S.: 35.0%)High School or Lower17.7%
Statistics are population-weighted aggregations from Census ACS 5-year estimates.See Sources for details.
Overlay Area Code
This area code is part of an overlay region, meaning the same geographic area is served by multiple area codes. Overlay codes were introduced to meet growing demand for phone numbers without requiring existing customers to change their numbers.
This area code shares its geographic region with: area code 628.
In service since: 01-Jan-1947
Area Code Splits
Parts of this area code’s original geographic region were later assigned new area codes through splits. When a split occurs, some customers in the original area code region are assigned the new area code.
Split into: area code 650.
Call Context
This area code includes San Francisco and surrounding communities in California. It is one of the original area codes established when the North American Numbering Plan was created in 1947.
County Coverage
Population-weighted county share based on aggregated ZCTA population (100% = total mapped population for area code 415).
| County | Population | Share |
|---|---|---|
| San Francisco, CA | 849,003 | 73.4% |
| Marin, CA | 257,358 | 22.2% |
| San Mateo, CA | 50,987 | 4.4% |
Nearby Area Codes
Area codes geographically closest to 415.
Frequently Asked Questions
Common questions about area code 415 and how phone numbering works.
Phone numbers are assigned based on where the number was originally provisioned, not the caller's current location. Mobile phones retain their number when users move, and businesses may use numbers from regions where they don't have a physical presence. VoIP services can also provision numbers from virtually any area code.
Yes, mobile phones can have numbers from any area code in the region they were activated. Wireless carriers assign numbers from available pools regardless of phone type. When users change carriers or move to new areas, they typically keep their original number, which may have a different area code than their current location.
Start by looking up the area code on this site to understand its general geographic region. For the specific number, options include using your carrier's caller ID features or checking public directories. If you suspect fraud, you can report it to the FTC. To file a complaint about robocalls or spoofed numbers, visit the FCC Consumer Complaint Center. You can also register your number with the National Do Not Call Registry to reduce unwanted calls. Keep in mind that caller ID can display any name the caller chooses to set.
When an area's pool of available phone numbers runs low, regulators may introduce an "overlay" area code that covers the same geographic territory as the original. Both codes coexist, and new numbers are assigned from whichever code has availability. Learn more in our overlay vs split guide.
While San Francisco is a prominent city in this area code's coverage, the code serves the broader surrounding region as well. Area codes are assigned geographically and typically cover multiple cities, towns, and communities beyond any single anchor city.
This area code covers a metropolitan region with high population density. Dense urban areas typically have higher call volumes and may have multiple overlapping area codes to meet demand for phone numbers. Businesses and residents in these areas are more likely to need additional numbering resources.