--- title: "Area code 640: New Jersey, United States" url: "https://lookvalid.com/area-code/640.md" canonical_url: "https://lookvalid.com/area-code/640" last_updated: "2026-10-23" type: "reference" summary: "Area code 640 serves New Jersey, United States. Number formats, numbering rules, a live phone validator and the other codes in New Jersey." --- # Area code 640: New Jersey, United States Area code 640 serves New Jersey, United States. Number formats, numbering rules, a live phone validator and the other codes in New Jersey. NANPA lists 124 central office codes (prefixes) in use in area code 640, held by 20 holders across 35 rate centers. New Cingular Wireless PCS holds the most prefixes, 29 (23%). 100% of the prefixes are pooled, which means their thousands-blocks can belong to different companies. The FCC unwanted-call data has 144 complaints on file for 141 numbers in 640, most often filed as "Unwanted Calls". These are consumer reports, not findings. ## Facts - In service since: 2018-09-17 - Time zone: Eastern (E) - Assigned overlays: 609 (1957-01-01) - Prefixes in use: 124 - Pooled prefixes: 124 (100%) - Rate centers: 35 - Companies holding prefixes: 20 - Assignment dates on file: 2018-11-26 to 2026-05-21 (124 prefixes) - ZIP codes in its places: 54 ## Rate centers | Rate center | Prefixes | Share | | --- | --- | --- | | ATLNTIC CY | 16 | 13% | | LAWRENCEVL | 16 | 13% | | PLEASANTVL | 13 | 10% | | PRINCETON | 7 | 6% | | TRENTON | 6 | 5% | | BARNEGAT | 5 | 4% | | CRANBURY | 5 | 4% | | ALLENTOWN | 4 | 3% | | 27 other rate centers | 52 | 42% | ## Carriers | Holder | Prefixes | Share | | --- | --- | --- | | New Cingular Wireless PCS | 29 | 23% | | Onvoy | 26 | 21% | | Omnipoint Communications Enterprises | 16 | 13% | | Verizon Wireless | 8 | 6% | | Bandwidth.com CLEC | 7 | 6% | | Fractel | 7 | 6% | | 14 other carriers | 31 | 25% | A prefix holder is the company a code was assigned to, not necessarily a number's current carrier, because numbers can be ported to another company. ## History - 1957-01-01: Area code 609, named as the parent of 640 in the NANPA report, was in service. - 2018-09-17: Area code 640 went into service. ## Nearest area codes The area codes closest to 640, measured between the centers of the ZIP code places they serve, are 732 (about 29 miles), 848 (about 29 miles), 215 (about 33 miles), 267 (about 33 miles) and 856 (about 33 miles). ## ZIP codes 54 ZIP codes fall in places that have a rate center in this area code. The places with the most are Trenton, NJ (27 ZIP codes), Princeton, NJ (5 ZIP codes) and Allentown, NJ (1 ZIP code). A ZIP code and an area code are unrelated systems, so a ZIP code can sit in more than one area code and an area code spans many ZIP codes. ## Complaints on file 144 complaints for 141 numbers. Numbers whose latest complaint falls in each year: - 2023: 23 - 2024: 38 - 2025: 27 ## Questions ### Where is area code 640? NANPA assigns area code 640 to New Jersey, United States. ### In which state does area code 640 sit? New Jersey. 640 is one of 10 area codes the NANPA table assigns to the state. ### Which places does area code 640 cover? The places with the most ZIP codes among the rate centers in 640 are Trenton, NJ, Princeton, NJ and Allentown, NJ. The rate center list on this page shows all of them. ### Who owns area code 640? NANPA assigns area codes. Within 640, New Cingular Wireless PCS holds the most prefixes, 29 prefixes or 23%. ### Which time zone does 640 use? The NANPA NPA report lists the time zone for 640 as Eastern (E). ### What year did 640 enter service? The NANPA NPA report gives an in-service date of 2018-09-17, so 640 has been in use since 2018. ### Does area code 640 have an overlay? Yes. 609 (in service 1957-01-01) shares the same area with 640, so numbers from all of them are local to each other. ### Which area codes are nearest to 640? The area codes closest to 640, measured between the centers of the ZIP code places they serve, are 732 (about 29 miles), 848 (about 29 miles), 215 (about 33 miles), 267 (about 33 miles) and 856 (about 33 miles). ### How many prefixes does area code 640 have? NANPA's report dated 2026-10-17 lists 124 prefixes in service in 640, spread over 35 rate centers and 20 holders. ### Are there complaints about 640 numbers? The FCC data on file has 144 complaints for 141 numbers in 640. They are unverified consumer reports. A number with no complaints on file is not proven safe. Sources: NANPA central office code report dated 2026-10-17; NANPA NPA report dated 2026-10-18; FCC unwanted-call complaints, data fetched 2026-10-17; ZIP code places from GeoNames (CC BY 4.0).