Area codes · +1
Area code 408
Area code 408 covers San Jose, California. We hold 5,103 allocated blocks for it across 14 rate centres, split 33% mobile, 59% landline and 9% VoIP.
The other area codes laid over 408
Area code 408 does not have San Jose, California to itself. 1 other code — 669 — 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.
6692,545 blocks, 11 rate centres, mostly mobile
Each holds its own blocks and its own carrier mix, so a 408 number and a 669 number from the same street can report different line types. Filtering San Jose, California by area code needs all 2 of them.
408 is not confined to San Jose, California 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, 408 and others. By allocated blocks 408 is the 21th largest of them, holding 3% of the California total.
Where 408 numbers are concentrated
NANPA truncates rate-centre names to ten characters and drops the spaces, which is why Xxxxxxxxxx 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 408 |
|---|---|---|
| San Jose | 1,611 | 32% |
| San Jose | 919 | 18% |
| Sunnyvale | 776 | 15% |
| San Jose | 620 | 12% |
| Campbell | 353 | 7% |
| Los Gatos | 194 | 4% |
| San Martin | 165 | 3% |
| Morganhill | 159 | 3% |
| Saratoga | 145 | 3% |
| Gilroy | 126 | 2% |
| Salinas | 14 | 0% |
| Sanantonio | 11 | 0% |
| Hollister | 3 | 0% |
| Xxxxxxxxxx | 1 | 0% |
Carriers holding the most 408 blocks
Pacific Bell1,373 blocks
Bandwidth439 blocks
T-Mobile USA, Inc.391 blocks
Verizon Wireless369 blocks
AT&T Wireless339 blocks
Onvoy328 blocks
The largest holder, Pacific Bell, has 27% of the code.
These are original allocations. A number keeps its digits and its block when its subscriber moves network, so a ported 408 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 408 number, or run a whole list through the free cleaner — neither uploads anything.
Common questions
Where is area code 408?
Area code 408 covers San Jose, California. It is not the only code there: 669 is an overlay on the same rate centres, so a San Jose, California number can start with any of them.
Is a 408 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 408 the split runs 33% mobile, 59% landline and 9% VoIP, so landline is the most likely single answer.
Which carriers hold 408 numbers?
The largest holders are Pacific Bell, Bandwidth, 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 408 numbers are there?
The code holds 5,103 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 408 covers on the order of 5,103,000 possible numbers — most of which have never been issued to anyone.