Pennsylvania · Eastern Time
610 Area Code
Area code 610 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 484 and 835, so 10-digit dialing is required.
Last updated October 1, 2026 · Source: NANPA
Where is the 610 area code?
610 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 610 area code
- Allentown
- Reading
- Bethlehem
- Easton
- Chester
- Norristown
- West Chester
- King of Prussia
- Upper Darby
- Media
- Phoenixville
- Pottstown
- Emmaus
Counties served by 610
Lehigh County, Northampton County, Berks County, Chester County, Delaware County, Montgomery County and Bucks County.
610 overlay codes and dialing
The 610 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 610 area code
610 went into service on January 8, 1994, created when it was split from 215. It serves Allentown and the surrounding part of Pennsylvania, and today shares its territory with overlay codes 484 and 835. For how codes are created, split, and overlaid, see how area codes work.
Is 610 a scam or spam risk?
610 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 610 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 6XX 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
610 area code FAQ
Where is the 610 area code?
The 610 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 610 area code?
Cities in the 610 area code include Allentown, Reading, Bethlehem, Easton, Chester, Norristown, West Chester, King of Prussia, Upper Darby and Media.
What time zone is 610 in?
610 is in the Eastern Time zone.
What is the overlay for the 610 area code?
610 shares its territory with 484 and 835. All 3 codes (484, 610, 835) serve the same area, so 10-digit dialing is required for every call.
When did the 610 area code start?
610 went into service on January 8, 1994.
Do I have to dial 10 digits for 610?
Yes. Because 610 is an overlay area, you must dial the full 10-digit number (area code + 7 digits) for every call.
Is 610 a toll-free or premium code?
No. 610 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.