Area Code 610

About Area Code 610

Area code 610 is a geographic telephone area code assigned to Allentown, Pennsylvania. It operates in the Eastern time zone and was first introduced in 1994. Split from 215. Eastern Pennsylvania. Overlay 484 (1999), 835 TBD.

Within Pennsylvania, area code 610 shares numbering capacity with 12 other area codes. The state's 12,964,056-person population (2023 Census Bureau estimate) is served by a combined 13 active codes, with 610 primarily responsible for the Allentown region. Pennsylvania's state capital is Harrisburg, and its largest city is Philadelphia.

When you receive a call from a 610 number on your Caller ID, the call originated from a phone number assigned to the 610 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 610 only confirms where the number was originally assigned.

Where is the 610 area code located?

Area code 610 is assigned to Allentown, Pennsylvania, in the Eastern time zone. The state of Pennsylvania uses 13 active area codes, and 610 is one of them. Calls placed from the 610 area code originate from numbers assigned by NANPA — the North American Numbering Plan Administrator — and the 610 prefix appears on Caller ID for both landline and wireless calls placed from this region.

The Eastern time zone observes Daylight Saving Time, shifting from UTC-5 to UTC-4 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 610 area code?

The 610 area code serves 10 notable cities, listed below in order of population. The largest city in the 610 territory is Allentown (125,845 residents in Lehigh County).

• Allentown, PA — 125,845 residents (5.1% of 610 numbers)
• Philadelphia, PA — 1,567,442 residents (62.9% of 610 numbers)
• Pittsburgh, PA — 302,971 residents (12.2% of 610 numbers)
• Erie, PA — 93,928 residents (3.8% of 610 numbers)
• Reading, PA — 95,112 residents (3.8% of 610 numbers)
• Scranton, PA — 75,799 residents (3% of 610 numbers)
• Bethlehem, PA — 76,568 residents (3.1% of 610 numbers)
• Lancaster, PA — 58,039 residents (2.3% of 610 numbers)
• Harrisburg, PA — 50,118 residents (2% of 610 numbers)
• York, PA — 44,800 residents (1.8% of 610 numbers)

Phone number format in area code 610

All phone numbers within area code 610 follow the standard North American 10-digit format:(610) 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 + 610 + 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 610 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 610

Split from 215. Eastern Pennsylvania. Overlay 484 (1999), 835 TBD.

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 610 area code safe to answer?

Area code 610 itself is a normal geographic code with no elevated spam risk. That said, scammers can spoof any area code — including 610 — so if you don't recognize the full number, let it go to voicemail and verify the caller's identity before calling back.