The 484 area code is an overlay serving southeastern Pennsylvania, layered over the 610 code across the Philadelphia suburbs, Lehigh Valley, and Berks County. Introduced in 1999 to supply new phone numbers, 484 covers the exact same territory as 610. If a 484 number has appeared on your caller ID, this guide explains where it comes from, how to dial it, and how to stay safe from spoofed calls.
Quick Summary: Area Code 484 at a Glance
| Detail | Information |
|---|---|
| Area Code | 484 |
| State | Pennsylvania (PA) |
| Major Cities | Allentown, Reading, Bethlehem, Chester |
| Time Zone | Eastern Time (ET) |
| Country Code | +1 (USA) |
| Overlay Codes | 610, 835 (co-located) |
Geographic Coverage & Major Cities
Area code 484 covers the western and southern suburbs of Philadelphia and the Lehigh Valley, including Delaware, Chester, Berks, Lehigh, and Northampton counties. Because it is an overlay, it shares the identical footprint of the 610 area code rather than covering a separate zone.
- Allentown & Bethlehem – the Lehigh Valley’s largest cities
- Reading – the seat of Berks County
- Chester & West Chester – Delaware and Chester county hubs
- Easton, Norristown & Pottstown – established suburban communities
As a newer code over southeastern PA, 484 numbers are common among lines set up after the original 610 numbers grew scarce.
A Brief History of Area Code 484
Area code 484 was activated in 1999 as an all-services overlay on the 610 region. The 610 code itself split from 215 in 1994. An overlay adds a second area code across the same geographic area, so existing 610 customers kept their numbers while new lines could be assigned 484, under mandatory 10-digit dialing. A further overlay, 835, was later assigned to the same region.
Time Zone & Best Time to Call
Numbers in the 484 area code use Eastern Time (ET). The region observes Daylight Saving Time, shifting from EST (UTC-5) to EDT (UTC-4) between March and November each year.
How to Dial Phone Numbers in Area Code 484
Because 484 shares its region under an overlay, the area requires 10-digit dialing on every call.
Calling within the United States or Canada
- 10-digit dialing: Include the area code – 484-XXX-XXXX.
- 11-digit dialing: You can also dial 1-484-XXX-XXXX; the leading 1 is the NANP country code.
Calling from outside the United States
- Format: [exit code] + 1 + 484 + XXX + XXXX
- From the UK, Europe, or most of Asia/Africa: 00 1 484 XXX XXXX
- From any mobile phone worldwide: +1 484 XXX XXXX
Is Area Code 484 a Scam? Safety & Protection Tips
Area code 484 is a legitimate Pennsylvania area code – a call from it is not fraudulent by default. However, scammers frequently spoof local codes like 484, faking the caller ID so their number appears to come from a trusted local line. Neighbor spoofing, which mimics the first six digits of your own number, is especially common.
Common scam tactics linked to this region
| Scam type | What to watch for |
|---|---|
| Government impersonation | Callers posing as the IRS or SSA threatening arrest or fines |
| Bank & card fraud alerts | Claims of suspicious activity seeking your account details |
| Utility shut-off threats | Fake PECO or PPL Electric disconnection demands |
| Package delivery scams | Fake texts or calls about a failed delivery with a bad link |
How to report, block, and look up 484 callers
- Never share personal or financial details with an unexpected caller, however urgent they sound.
- Block the number using your phone’s built-in call-blocking feature or a reputable call-screening app.
- Look up the number with a trusted reverse phone lookup before returning any call.
- Report it to the FTC at reportfraud.ftc.gov and register at DoNotCall.gov.
Nearby & Related Area Codes in Pennsylvania
Area code 484 shares and borders several other Pennsylvania codes:
- 610 – the original southeastern PA code that 484 overlays (see our 610 area code guide)
- 835 – a further overlay assigned to the 610/484 region (see our 835 area code guide)
- 215, 267 & 445 – the city of Philadelphia to the east (see our 215 area code guide)
- 717 & 223 – south-central Pennsylvania to the west (see our 717 area code guide)
Explore more codes across the state on our Pennsylvania area codes hub, or browse every prefix in our US area codes directory.
↑ See the complete list of All US Area Codes by State – every area code across all 50 states in one directory.
Explore Neighboring States
Researching area codes just across the state line? Start with these codes in the states that border Pennsylvania:
- New York – area code 212
- New Jersey – area code 201
- Delaware – area code 302
- Maryland – area code 410
- West Virginia – area code 304
- Ohio – area code 216
Frequently Asked Questions About Area Code 484
Where is the 484 area code located?
Area code 484 covers the Philadelphia suburbs, Lehigh Valley, and Berks County as an overlay of the 610 code. It operates on Eastern Time.
What is the difference between 484 and 610?
There is no geographic difference. 484 overlays the exact same southeastern-PA territory as 610; it was added in 1999 simply to supply more phone numbers.
Is 484 a landline or cell phone area code?
Both. Area code 484 serves landlines, mobile phones, and VoIP numbers throughout southeastern Pennsylvania.
Should I answer a call from an unknown 484 number?
If you are not expecting the call, let it go to voicemail. Legitimate callers leave a message, while spoofed or robocall numbers usually will not. Verify any unfamiliar number with a reverse lookup before calling back.
Related 484 Guides
- Is a 484 call safe? Read Is area code 484 a scam? Spam & safety guide.
- Local coverage: see the Allentown area code guide.
- Worried about spam or robocalls? Browse our Scam Alerts directory.