Pennsylvania · Eastern Time
484 Area Code
Area code 484 is in Pennsylvania, serving southeastern Pennsylvania: Lehigh Valley, Berks County and Philadelphia's suburbs. It is in the Eastern Time zone. It shares its territory with overlay codes 610 and 835, so 10-digit dialing is required.
Last updated October 1, 2026 · Source: NANPA
Where is the 484 area code?
484 is a Pennsylvania area code covering southeastern Pennsylvania: Lehigh Valley, Berks County and Philadelphia's suburbs. In the wider directory it sits in the Northeast region.
Cities in the 484 area code
- Allentown
- Reading
- Bethlehem
- Easton
- Chester
- Norristown
- West Chester
- King of Prussia
- Upper Darby
- Media
- Phoenixville
- Pottstown
- Emmaus
Counties served by 484
Lehigh County, Northampton County, Berks County, Chester County, Delaware County, Montgomery County and Bucks County.
484 overlay codes and dialing
The 484 territory is covered by an overlay of 3 area codes: 484, 610, 835. All of them serve the same geographic area, and the original code is 610. 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 484 area code
484 went into service on June 5, 1999 as an overlay of 610, relieving number exhaustion in the Allentown area. Rather than splitting the region, the overlay lets existing customers keep their numbers while new lines draw from the added code. Learn more in our overlay guide.
Is 484 a scam or spam risk?
484 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 484 number on your screen is no guarantee the caller is in Allentown, 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
484 area code FAQ
Where is the 484 area code?
The 484 area code is in Pennsylvania, covering southeastern Pennsylvania: Lehigh Valley, Berks County and Philadelphia's suburbs, in the Northeast region.
What cities are in the 484 area code?
Cities in the 484 area code include Allentown, Reading, Bethlehem, Easton, Chester, Norristown, West Chester, King of Prussia, Upper Darby and Media.
What time zone is 484 in?
484 is in the Eastern Time zone.
What is the overlay for the 484 area code?
484 shares its territory with 610 and 835. All 3 codes (484, 610, 835) serve the same area, so 10-digit dialing is required for every call.
When did the 484 area code start?
484 went into service on June 5, 1999 as an overlay of 610.
Do I have to dial 10 digits for 484?
Yes. Because 484 is an overlay area, you must dial the full 10-digit number (area code + 7 digits) for every call.
Is 484 a toll-free or premium code?
No. 484 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.