Where is the 640 area code?

Area code 640 covers New Jersey, on Eastern Time.

What time zone is area code 640 in?

Numbers in the 640 area code sit in Eastern Time.

Is 640 a toll-free or scam area code?

No. 640 is a geographic North American Numbering Plan area code assigned to New Jersey. Toll-free numbers use 800, 833, 844, 855, 866, 877 and 888. A call from 640 can still be spoofed, so treat unexpected calls with the usual caution.

Area code lookup

640 area code

Where the 640 area code is, which cities and counties it serves, the local time zone and the overlay codes dialled alongside it.

State: NJ
Codes in state: 10
Overlays & neighbours: 9
Time zone: Eastern Time

Quick answer

Area code 640 is a geographic area code assigned to New Jersey under the North American Numbering Plan. New Jersey observes Eastern Time, and the state also holds 9 other area codes: 201, 551, 609, 732, 848, 856, 862, 908, 973.

Largest cities in New Jersey

The largest places in New Jersey. Each links to its full local profile: population, income, housing and sales tax.

City	Population
Newark city	307,188
Jersey City city	289,691
Paterson city	157,660
Elizabeth city	135,887
Toms River CDP	93,915
Trenton city	89,966
Clifton city	89,247
Camden city	71,471
Bayonne city	70,468
Lakewood CDP	69,884
Passaic city	69,651
East Orange city	69,183

All New Jersey cities All New Jersey ZIP codes New Jersey sales tax

Related area codes

Codes that share or border the same calling area.

640 area code FAQ

The questions people ask about this code.

Where is area code 640?

640 is a geographic area code in New Jersey.

What time is it in the 640 area code?

640 observes Eastern Time.

Is 640 a scam area code?

No — it is a normal geographic code, not a toll-free or premium-rate prefix. Caller ID can be spoofed on any code, so verify unexpected callers before sharing information.

Sources & transparency

North American Numbering Plan Administrator (NANPA) area code assignments — area code to geography mapping and overlay relationships
US Census Bureau, American Community Survey 2019-2023 5-year estimates — city, county and ZIP code geography

Last reviewed August 2026. Figures are published for reference and can change; verify with the source agency before filing or contracting. How we build and check this data.