Area Code 512

About Area Code 512

Area code 512 is a geographic telephone area code assigned to Austin, Texas. It operates in the Central time zone and was first introduced in 1947. Original NANP code. Austin metro. Overlay 737 (2013).

Within Texas, area code 512 shares numbering capacity with 27 other area codes. The state's 30,503,301-person population (2023 Census Bureau estimate) is served by a combined 28 active codes, with 512 primarily responsible for the Austin region. Texas's state capital is Austin, and its largest city is Houston.

When you receive a call from a 512 number on your Caller ID, the call originated from a phone number assigned to the 512 area code — but be aware that Local Number Portability (in effect since 2003) means the caller could be physically located anywhere in the US or Canada. Area code 512 only confirms where the number was originally assigned.

Where is the 512 area code located?

Area code 512 is assigned to Austin, Texas, in the Central time zone. The state of Texas uses 28 active area codes, and 512 is one of them. Calls placed from the 512 area code originate from numbers assigned by NANPA — the North American Numbering Plan Administrator — and the 512 prefix appears on Caller ID for both landline and wireless calls placed from this region.

The Central time zone observes Daylight Saving Time, shifting from UTC-6 to UTC-5 in summer. The local time shown above is always current, so you can quickly check whether it's a reasonable hour to call back.

What cities and counties use the 512 area code?

The 512 area code serves 8 notable cities, listed below in order of population. The largest city in the 512 territory is Austin (974,447 residents in Travis County).

• Austin, TX — 974,447 residents (11.7% of 512 numbers)
• Houston, TX — 2,302,878 residents (27.5% of 512 numbers)
• Dallas, TX — 1,304,379 residents (15.6% of 512 numbers)
• San Antonio, TX — 1,434,625 residents (17.2% of 512 numbers)
• Fort Worth, TX — 956,709 residents (11.4% of 512 numbers)
• El Paso, TX — 678,058 residents (8.1% of 512 numbers)
• Arlington, TX — 394,266 residents (4.7% of 512 numbers)
• Corpus Christi, TX — 317,863 residents (3.8% of 512 numbers)

Phone number format in area code 512

All phone numbers within area code 512 follow the standard North American 10-digit format:(512) NXX-XXXX. The NXX is the central office prefix (also called an "exchange") and XXXX is the subscriber line number. For long-distance calls within the NANP, dial 1 + 512 + NXX + XXXX. From outside North America, dial your country's international access code, then 1 (the NANP country code), then the 10-digit number.

If you need to verify whether a specific 512 number is wireless, landline, or VoIP, you can use our reverse phone lookup tool. Be aware that number portability means the area code no longer guarantees the caller's physical location — only where the number was first assigned.

History of area code 512

Original NANP code. Austin metro. Overlay 737 (2013).

The original 86 area codes were assigned by AT&T and Bell Labs in 1947 as part of the North American Numbering Plan. At the time, rotary-dial phones meant codes with lower digits (like 212 for NYC, 213 for LA, 312 for Chicago) were given to the largest cities because they took less time to dial. Today's area code assignments still reflect those early choices, even though touch-tone and cell phones made the original reason obsolete.

Is the 512 area code safe to answer?

Area code 512 itself is a normal geographic code with no elevated spam risk. That said, scammers can spoof any area code — including 512 — so if you don't recognize the full number, let it go to voicemail and verify the caller's identity before calling back.