The area code 609 is located in Allentown, New Jersey.
Area code 609 serves Allentown, New Jersey, a historic borough in western Monmouth County near the Mercer County line. It connects Allentown with key parts of central and southern New Jersey, including the state capital and the Jersey Shore. First established in 1958 after a split from 201, 609 has long been a primary code for the region’s government, education, tourism, and coastal communities. Allentown’s charming downtown and the nearby farm country sit within this classic New Jersey calling area.
Area code 609 covers a wide stretch of communities and landmarks, including:
These places show how 609 ties together colleges, government centers, shore towns, and the Pinelands. For callers, that means 609 phone numbers can point to everything from historic streets to beach resorts.
In 2018, area code 640 was added as an overlay to 609, so ten-digit dialing is standard across the region. “640 serves as an all-services overlay of 609.” — North American Numbering Plan Administrator (NANPA)
An earlier change came in 1999, when area code 856 split off to cover much of southwestern New Jersey. Today, 609/640 still includes major hubs like Trenton, Princeton, Atlantic City, and Cape May, making it a familiar code for state government, higher education, and shore tourism. Local numbers in Allentown follow Eastern Time (ET), with daylight saving time observed.