Numbers with prefix 640 in United States
In United States's numbering plan, the area code 640 covers New Jersey. It identifies where a line was allocated, not who is calling: numbers are portable and caller ID can be spoofed, so the digits alone do not identify the caller.
Search a number with prefix 640
Search a phone number or a company name (Bank of America, Verizon and AT&T...) to check if it has been reported as spam.
Numbers reported with prefix 640
16 numbersAbout numbers 640
Numbers starting with 640 are landlines in United States. They are assigned geographically. Sales calls from landlines are common, especially from telecom and energy companies.
Official source and review
Google libphonenumber (compiled from national numbering plans) · Document: 2026-08-28 · Reviewed: 2026-08-31
A prefix describes an official allocation. Portability and caller-ID spoofing mean it cannot identify the caller on its own.