Cities in area code 628
628 numbers are anchored to 14 rate centers across California. Each row shows how many active prefixes the locality holds — a direct measure of its numbering footprint.
By numbering footprint the leading localities are San Francisco:central Da, San Francisco:montrose-evergreen Da, San Rafael, San Francisco:juniper Da, Belvedere, Novato, Corte Madera and Mill Valley, and 5 smaller communities down to single-prefix localities. Prefix counts track lines in service, so the ranking is a reasonable proxy for where the code's subscribers actually are.
Metropolitan coverage: 14 rate centers belong to FCC top-100 metro areas.
Overlap note: 14 localities are shared with other area codes, so a neighbor's number may differ in its first three digits.
Clock-wise the coverage is Pacific.
A caller's real location can differ: numbers port between carriers and follow their owners when they move. Use the prefix tables to see where a specific number block was issued.
| Locality (rate center) | Active prefixes | Metro area | All codes serving it |
|---|---|---|---|
| San Francisco:central Da | 76 | San Francisco-Oakland-Fremont, CA | 415, 628 |
| San Francisco:montrose-evergreen Da | 26 | San Francisco-Oakland-Fremont, CA | 415, 628 |
| San Rafael | 16 | San Francisco-Oakland-Fremont, CA | 415, 628 |
| San Francisco:juniper Da | 14 | San Francisco-Oakland-Fremont, CA | 415, 628, 650 |
| Belvedere | 10 | San Francisco-Oakland-Fremont, CA | 415, 628 |
| Novato | 7 | San Francisco-Oakland-Fremont, CA | 415, 628 |
| Corte Madera | 7 | San Francisco-Oakland-Fremont, CA | 415, 628 |
| Mill Valley | 7 | San Francisco-Oakland-Fremont, CA | 415, 628 |
| Sausalito | 7 | San Francisco-Oakland-Fremont, CA | 415, 628 |
| Ignacio | 6 | San Francisco-Oakland-Fremont, CA | 415, 628 |
| Nicasio | 5 | San Francisco-Oakland-Fremont, CA | 415, 628 |
| Inverness | 4 | San Francisco-Oakland-Fremont, CA | 415, 628 |
| Point Reyes | 4 | San Francisco-Oakland-Fremont, CA | 415, 628 |
| Stinson Beach-bolinas | 3 | San Francisco-Oakland-Fremont, CA | 415, 628 |
FAQ
What is the biggest city in area code 628?
San Francisco:central Da holds the most active prefixes (76), making it the code's largest numbering locality.
How many places does 628 cover?
14 rate centers in California hold active 628 prefixes, from San Francisco:central Da down to communities with a single prefix.
Does a 628 number guarantee the caller lives in one of these places?
No — the tables show where number blocks were issued. Porting and VoIP let people keep or acquire numbers anywhere.