Area codes · +1
Area code 210
Area code 210 covers San Antonio. We hold 6,382 allocated blocks for it across 1 rate centre, split 48% mobile, 46% landline and 6% VoIP.
The other area codes laid over 210
Area code 210 does not have San Antonio to itself. 1 other code — 726 — 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.
7261,210 blocks, 1 rate centre, mostly mobile
Each holds its own blocks and its own carrier mix, so a 210 number and a 726 number from the same street can report different line types. Filtering San Antonio by area code needs all 2 of them.
Texas is split across 28 area codes — 346, 832, 469, 210, 956, 512 and others. By allocated blocks 210 is the 4th largest of them, holding 5% of the Texas total.
Where 210 numbers are concentrated
Rate-centre names are reproduced as NANPA records them. The agency truncates them to ten characters, so longer names appear shortened elsewhere on this site.
| Rate centre | Blocks | Share of 210 |
|---|---|---|
| Sanantonio | 6,374 | 100% |
Carriers holding the most 210 blocks
Southwestern Bell1,321 blocks
AT&T Wireless1,199 blocks
T-Mobile Usa, Inc.712 blocks
T-Mobile USA, Inc.574 blocks
Onvoy398 blocks
Bandwidth387 blocks
The largest holder, Southwestern Bell, has 21% of the code.
These are original allocations. A number keeps its digits and its block when its subscriber moves network, so a ported 210 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 210 number, or run a whole list through the free cleaner — neither uploads anything.
Common questions
Where is area code 210?
Area code 210 covers San Antonio. It is not the only code there: 726 is an overlay on the same rate centres, so a San Antonio number can start with any of them.
Is a 210 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 210 the split runs 48% mobile, 46% landline and 6% VoIP, so mobile is the most likely single answer.
Which carriers hold 210 numbers?
The largest holders are Southwestern Bell, AT&T 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 210 numbers are there?
The code holds 6,382 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 210 covers on the order of 6,382,000 possible numbers — most of which have never been issued to anyone.