Area Code 640

About Area Code 640

Area code 640 is a geographic telephone area code assigned to Atlantic City, New Jersey. It operates in the Eastern time zone and was first introduced in 2023. Overlay for 609. Southern New Jersey.

Within New Jersey, area code 640 shares numbering capacity with 9 other area codes. The state's 9,290,841-person population (2023 Census Bureau estimate) is served by a combined 10 active codes, with 640 primarily responsible for the Atlantic City region. New Jersey's state capital is Trenton, and its largest city is Newark.

When you receive a call from a 640 number on your Caller ID, the call originated from a phone number assigned to the 640 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 640 only confirms where the number was originally assigned.

Where is the 640 area code located?

Area code 640 is assigned to Atlantic City, New Jersey, in the Eastern time zone. The state of New Jersey uses 10 active area codes, and 640 is one of them. Calls placed from the 640 area code originate from numbers assigned by NANPA — the North American Numbering Plan Administrator — and the 640 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 640 area code?

The 640 area code serves 11 notable cities, listed below in order of population. The largest city in the 640 territory is Newark (311,549 residents in Essex County).

• Newark, NJ — 311,549 residents (21.4% of 640 numbers)
• Jersey City, NJ — 292,449 residents (20.1% of 640 numbers)
• Paterson, NJ — 156,763 residents (10.8% of 640 numbers)
• Elizabeth, NJ — 135,772 residents (9.3% of 640 numbers)
• Toms River, NJ — 94,706 residents (6.5% of 640 numbers)
• Trenton, NJ — 90,871 residents (6.3% of 640 numbers)
• Clifton, NJ — 89,170 residents (6.1% of 640 numbers)
• Camden, NJ — 73,562 residents (5.1% of 640 numbers)
• Bayonne, NJ — 70,389 residents (4.8% of 640 numbers)
• Passaic, NJ — 70,537 residents (4.9% of 640 numbers)

Phone number format in area code 640

All phone numbers within area code 640 follow the standard North American 10-digit format:(640) 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 + 640 + 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 640 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 640

Overlay for 609. Southern New Jersey.

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 640 area code safe to answer?

Area code 640 itself is a normal geographic code with no elevated spam risk. That said, scammers can spoof any area code — including 640 — so if you don't recognize the full number, let it go to voicemail and verify the caller's identity before calling back.