Austin (overlay)

The overlay of area code 512, covering the Austin metropolitan area. Placed in service in 2013.

The essentials Numbering data · NumberResearch · as of 2026-09-18

Place

Austin (overlay)

Type

geographic

Status

in service

In service since

2013

Projected exhaust

2044 Q1

Status, dates and counts are read from NumberResearch (NANPA / CNAC / FCC records). Assignment records show initial assignees, not the carrier serving a number today.

A · Where it is

Where 737 is

Central Texas: the greater Austin metropolitan area (same footprint as 512).

Communities served wholly or partly by 737:

AustinRound RockGeorgetownSan MarcosCedar ParkPflugerville

Representative; overlay covers the same counties as 512.

B · Relationships

How it relates to other codes

The codes 737 was split from, spawned, or shares its area with. A split divides the map and changes some numbers; an overlay shares the same ground and changes none — what's the difference?

Overlay · 2013 512 Austin 737 is the overlay layered on 512.

What's changing. Active overlay of 512. Mandatory 10-digit dialing since June 2013.

C · History

How 737 got here

2013-07-01

Put into service as an overlay of 512 to stave off number exhaustion.

Source: Wikipedia (Area codes 512 and 737)

D · Capacity

How full it is

Prefixes assigned

346

Prefixes available

454

Thousands-blocks assigned

3,122

Prefix-assignment counts describe allocation to carriers, not how many individual numbers are in use. Full technical records: NumberResearch ↗.

Compare 737 with another code →

Sources

Wikipedia ↗

Area codes 512 and 737

NumberResearch.org ↗

Live status, dates, assignment counts and exhaust forecast — data as of 2026-09-18 (CC BY 4.0).

Place, relationships and history above are compiled by North American Numbers from the sources listed and last checked 2026-09-18. A check date is not an expert review — see how this is made. Flag an error.