Area codes · +1
Area code 628
Area code 628 covers San Francisco. We hold 2,074 allocated blocks for it across 14 rate centres, split 36% mobile, 40% landline and 24% VoIP.
The other area codes laid over 628
Area code 628 does not have San Francisco to itself. 1 other code — 415 — serves the same rate centres, laid over the same ground rather than dividing it. That is an overlay: a new code added when the old one ran out of numbers, covering the same streets. Two neighbours can hold different area codes, so the code says roughly when a number was issued rather than where it sits.
4155,720 blocks, 14 rate centres, mostly landline
Each holds its own blocks and its own carrier mix, so a 628 number and a 415 number from the same street can report different line types. Filtering San Francisco by area code needs all 2 of them.
628 is not confined to San Francisco itself: its blocks sit across 14 rate centres, named in the table below.
California is split across 40 area codes — 657, 707, 559, 209, 530, 628 and others. By allocated blocks 628 is the 32th largest of them, holding 1% of the California total.
Where 628 numbers are concentrated
NANPA truncates rate-centre names to ten characters and drops the spaces, which is why Stnsn-Blns is shortened. Names are reproduced as recorded rather than expanded — the abbreviation is the key the block data is filed under.
| Rate centre | Blocks | Share of 628 |
|---|---|---|
| San Francisco | 836 | 40% |
| San Francisco | 275 | 13% |
| San Rafael | 173 | 8% |
| San Francisco | 152 | 7% |
| Belvedere | 106 | 5% |
| Novato | 77 | 4% |
| Millvalley | 74 | 4% |
| Cortemadra | 71 | 3% |
| Sausalito | 65 | 3% |
| Ignacio | 60 | 3% |
| Nicasio | 47 | 2% |
| Inverness | 44 | 2% |
| Pointreyes | 43 | 2% |
| Stnsn-Blns | 31 | 1% |
Carriers holding the most 628 blocks
Onvoy491 blocks
Verizon Wireless201 blocks
T-Mobile USA, Inc.185 blocks
Bandwidth151 blocks
T-Mobile Usa, Inc.145 blocks
Teleport Communications America, Llc133 blocks
The largest holder, Onvoy, has 24% of the code.
These are original allocations. A number keeps its digits and its block when its subscriber moves network, so a ported 628 number still reports the carrier it started with. Closing that gap needs a live query against the routing database. How line type is derived.
Check a single 628 number, or run a whole list through the free cleaner — neither uploads anything.
Common questions
Where is area code 628?
Area code 628 covers San Francisco. It is not the only code there: 415 is an overlay on the same rate centres, so a San Francisco number can start with any of them.
Is a 628 number a mobile or a landline?
It can be either, and the digits do not say which. North American mobile and landline numbers share the same ranges, so the answer comes from the carrier holding the block. In 628 the split runs 36% mobile, 40% landline and 24% VoIP, so landline is the most likely single answer.
Which carriers hold 628 numbers?
The largest holders are Onvoy, Verizon Wireless, T-Mobile USA, Inc.. That is the carrier the block was allocated to, which is not necessarily the network a given number sits on today.
How many 628 numbers are there?
The code holds 2,074 allocated blocks in our copy of the numbering plan. A block is 1,000 or 10,000 consecutive numbers depending on how deeply it has been pooled, so 628 covers on the order of 2,074,000 possible numbers — most of which have never been issued to anyone.