Pennsylvania · Eastern Time
412 Area Code
Area code 412 is in Pennsylvania, serving Pittsburgh and most of Allegheny County in southwestern Pennsylvania. It is in the Eastern Time zone. It shares its territory with overlay code 878, so 10-digit dialing is required.
Last updated October 1, 2026 · Source: NANPA
Where is the 412 area code?
412 is a Pennsylvania area code covering Pittsburgh and most of Allegheny County in southwestern Pennsylvania. In the wider directory it sits in the Northeast region.
Cities in the 412 area code
- Pittsburgh
- Penn Hills
- Mount Lebanon
- Bethel Park
- Monroeville
- McKeesport
- West Mifflin
- Upper St. Clair
- Baldwin
- Shaler
- McCandless
Counties served by 412
Allegheny County.
412 overlay codes and dialing
The 412 territory is covered by an overlay of 2 area codes: 412, 878. All of them serve the same geographic area, and the original code is 412. Because more than one code covers the same ground, 10-digit dialing is mandatory — you must dial the area code for every local call. New phone lines may be assigned any of these codes.
History of the 412 area code
412 is one of the original area codes assigned in 1947, when AT&T and Bell Laboratories created the North American Numbering Plan and divided the country into the first 86 numbering plan areas. It has served the Pittsburgh area ever since, with 878 later added as an overlay to supply more numbers.
Is 412 a scam or spam risk?
412 is a legitimate geographic area code, not a premium or toll line, so a call from it costs you nothing extra. That said, scammers frequently spoof real local area codes to look familiar on caller ID. A genuine 412 number on your screen is no guarantee the caller is in Pittsburgh, PA or trustworthy. See spam & scam-risk area codes for how spoofing works and how to respond.
Other Pennsylvania area codes
Explore more
See every code in Pennsylvania, compare codes across the Northeast region, or view all Eastern Time codes. You can also browse the 4XX block or the complete numeric list of US area codes.
New to how this all works? Start with how area codes work, then read up on overlays, 10-digit dialing, and spam & scam-risk codes. To check another number, use the area code lookup tool.
Quick answers
412 area code FAQ
Where is the 412 area code?
The 412 area code is in Pennsylvania, covering Pittsburgh and most of Allegheny County in southwestern Pennsylvania, in the Northeast region.
What cities are in the 412 area code?
Cities in the 412 area code include Pittsburgh, Penn Hills, Mount Lebanon, Bethel Park, Monroeville, McKeesport, West Mifflin, Upper St. Clair, Baldwin and Shaler.
What time zone is 412 in?
412 is in the Eastern Time zone.
What is the overlay for the 412 area code?
412 shares its territory with 878. Both codes (412, 878) serve the same area, so 10-digit dialing is required for every call.
When did the 412 area code start?
412 went into service on January 1, 1947 as one of the original 1947 North American area codes.
Do I have to dial 10 digits for 412?
Yes. Because 412 is an overlay area, you must dial the full 10-digit number (area code + 7 digits) for every call.
Is 412 a toll-free or premium code?
No. 412 is a standard geographic area code, so calling it costs the same as any local or long-distance call on your plan. Toll-free calls use 800, 888, 877, 866, 855, 844 or 833.