Area codes · +1
Area code 512
Area code 512 is centred on Austin, Texas. We hold 6,021 allocated blocks for it across 36 rate centres, split 39% mobile, 55% landline and 6% VoIP.
The other area codes laid over 512
Area code 512 does not have Austin to itself. 1 other code — 737 — 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.
7373,470 blocks, 35 rate centres, mostly mobile
Each holds its own blocks and its own carrier mix, so a 512 number and a 737 number from the same street can report different line types. Filtering Austin by area code needs all 2 of them.
512 is not confined to Austin itself: its blocks sit across 36 rate centres, named in the table below.
Texas is split across 28 area codes — 346, 832, 469, 210, 956, 512 and others. By allocated blocks 512 is the 6th largest of them, holding 5% of the Texas total.
Where 512 numbers are concentrated
NANPA truncates rate-centre names to ten characters and drops the spaces, which is why Drippngspg and Liberty Hl are 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 512 |
|---|---|---|
| Austin | 4,104 | 68% |
| Georgetown | 289 | 5% |
| San Marcos | 206 | 3% |
| Bastrop | 179 | 3% |
| Lockhart | 111 | 2% |
| Leander | 102 | 2% |
| Burnet | 88 | 1% |
| Taylor | 67 | 1% |
| Rockdale | 66 | 1% |
| Lampasas | 56 | 1% |
| Buda | 55 | 1% |
| Kyle | 46 | 1% |
| Wimberley | 45 | 1% |
| Buchanndam | 44 | 1% |
| Dale/Ltnsp | 44 | 1% |
| Drippngspg | 44 | 1% |
| Elgin | 44 | 1% |
| Smithville | 44 | 1% |
| Jarrell | 34 | 1% |
| Adamsville | 33 | 1% |
| Bertram | 33 | 1% |
| Hutto | 33 | 1% |
| Liberty Hl | 33 | 1% |
| Paige | 33 | 1% |
12 further rate centres in 512 hold fewer blocks than these.
Carriers holding the most 512 blocks
Southwestern Bell1,170 blocks
AT&T Wireless784 blocks
T-Mobile Usa, Inc.512 blocks
T-Mobile USA, Inc.411 blocks
Bandwidth409 blocks
Verizon Wireless390 blocks
The largest holder, Southwestern Bell, has 19% of the code.
These are original allocations. A number keeps its digits and its block when its subscriber moves network, so a ported 512 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 512 number, or run a whole list through the free cleaner — neither uploads anything.
Common questions
Where is area code 512?
Area code 512 covers Austin, Texas. It is not the only code there: 737 is an overlay on the same rate centres, so a Austin, Texas number can start with any of them.
Is a 512 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 512 the split runs 39% mobile, 55% landline and 6% VoIP, so landline is the most likely single answer.
Which carriers hold 512 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 512 numbers are there?
The code holds 6,021 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 512 covers on the order of 6,021,000 possible numbers — most of which have never been issued to anyone.