Every ZIP code in the United States, with weather, radar, trivia and the numbers behind it. Five digits since 1963!

ZIP stands for Zone Improvement Plan. The codes went live on July 1, 1963.The lowest ZIP code is 00501 — the IRS in Holtsville, New York.The highest ZIP code is 99950, in Ketchikan, Alaska.Type 07734 into a calculator and turn it upside down: hELLO. It is Keansburg, New Jersey.12345 belongs to one company: General Electric in Schenectady, New York.The first digit is a region: 0 is New England and New Jersey, 9 is the West Coast, Alaska and Hawaii.Mr. ZIP, the cartoon mailman, was the mascot that sold the idea to America.ZIP+4 arrived in 1983 and can narrow a ZIP down to one side of one block.A ZIP code is a mail route, not a place: plenty of them cross county and even state lines.Play ZIP Hunt: guess the secret ZIP code of the day in six tries.
zipcodes.pro — AREA-CODE/512

512 area code

Area code 512 is in Texas. It covers Austin, Round Rock, Georgetown and 81 other places: 134 ZIP codes in Travis, Williamson, Hays and 8 other counties. Local time there is , Central Time. In service since 1947; 737 (2013) overlays it, so a number from there can have either code.

State
Texas
Time zone
Central
Largest city
Austin
Overlays
737
In service since
1947
Rate centres
36
Prefixes assigned
785 (7,850,000 numbers)

Who calls from a 512 number

NANPA records the carrier each block of 512 numbers is assigned to. Of the 7.8 million 512 numbers assigned, 33% are with local phone companies (AT&T); 33% with mobile carriers (AT&T Mobility, T-Mobile and Verizon Wireless); 31% with cable, internet-calling, business and other carriers (Level 3 and Onvoy); 2% with paging companies.

That is who the numbers were assigned to: people keep their number when they change carrier, so any one number may have moved since.

Carriers holding the most 512 numbers
CarrierKindShare
AT&TLandline29%
AT&T MobilityMobile14%
T-MobileMobile13%
Level 3Cable, VoIP, other9%
OnvoyCable, VoIP, other6%
Verizon WirelessMobile6%

An area code says where a number was issued, not where the caller is: people keep their numbers when they move, and caller ID can be set to show any number, which the FCC calls spoofing. If a call you did not expect asks for money or personal details, the FCC advises hanging up and calling the company back on a number you look up yourself. Unwanted calls can be reported to the FTC at ReportFraud.ftc.gov.

Places in area code 512

The 31 places with a telephone rate centre of their own using 512, largest first. Each links to its ZIP codes.

Places in area code 512
PlaceZIP codesPopulation
Austin, TX 74 979,539
Georgetown, TX 4 85,999
Leander, TX 3 74,067
San Marcos, TX 2 70,897
Kyle, TX 1 56,823
Hutto, TX 1 35,483
Taylor, TX 1 17,136
Buda, TX 1 15,859
Lockhart, TX 1 15,326
Elgin, TX 1 11,563
Bastrop, TX 1 11,156
Liberty Hill, TX 1 8,371
Lampasas, TX 1 7,671
Dripping Springs, TX 1 7,405
Burnet, TX 1 6,732
Rockdale, TX 1 5,523
Smithville, TX 1 4,216
Jarrell, TX 1 3,295
Wimberley, TX 1 2,891
Mc Dade, TX 1 2,409
Bertram, TX 1 2,037
Buchanan Dam, TX 1 1,513
Kempner, TX 1 1,215
Martindale, TX 1 1,072
Granger, TX 1 1,046
Lometa, TX 1 812
Coupland, TX 1 491
Milano, TX 1 487
Fentress, TX 1 331
Paige, TX 1 129
Briggs, TX 1 44

Nearby places using 512

These places have no rate centre of their own in NANPA's records; the nearest one uses 512. Near an area-code boundary that can be wrong for part of a town.

ZIP codes in area code 512

134 ZIP codes in 48 towns, by the town each is mailed to, largest first. Each links to its own page.

Where 512 numbers are issued

NANPA's rate centres with the most 512 prefixes (each prefix is 10,000 numbers), under NANPA's own abbreviated names.

Rate centres using area code 512
Rate centrePlacePrefixes
AUSTIN Austin 585
GEORGETOWN Georgetown 29
SAN MARCOS San Marcos 26
BASTROP Bastrop 19
LEANDER Leander 12
LOCKHART Lockhart 11

Counties

The counties of its ZIP codes, most residents first, with how many of its ZIP codes each has.

Which code covers where you are now? What area code am I in? answers from your location.

Questions about area code 512

Where is area code 512?

Area code 512 is in Texas. It covers Austin, Round Rock, Georgetown and 81 other places: 134 ZIP codes in Travis, Williamson, Hays and 8 other counties.

What ZIP codes are in area code 512?

134 ZIP codes, by the town each is mailed to: Austin (74, 73301 to 78799), Round Rock (6, 78664 to 78683), Georgetown (4, 78626 to 78633), Cedar Park (2, 78613 to 78630) and 44 more towns. The full list is on this page.

What time zone is area code 512 in?

Central time.

Is a 512 number a mobile or a landline?

It can be either. 33% of 512 numbers are assigned to mobile carriers and 33% to local phone companies (NANPA, 2026-10-10); the rest are with cable, internet-calling, business and paging carriers. A number keeps its area code when it moves to another carrier.

What area codes overlay 512?

737. They cover the same area as 512, so a new number there can be given any of them.

Does a 512 number mean the caller is in Texas?

Not necessarily. An area code says where the number was first issued. People keep their numbers when they move or switch carriers, and calling software can show any number, so a 512 call can come from anywhere.

Other area codes in Texas

All 29 Texas area codes, by area, with the cities each covers

Source: NANPA NPA database, central office code and thousands-block assignments, 2026-10-10. Places are matched to NANPA's rate centres by name; see sources.

Cite this page

zipcodes.pro. “Area code 512.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/area-code/512

Underlying data is public domain or openly licensed — sources, vintages and licences.