The area code 631 is located in Babylon, New York.
Area code 631 serves Babylon, NY and the rest of Suffolk County on eastern Long Island. Sitting on the South Shore along the Great South Bay, Babylon anchors the southwest corner of Suffolk, making 631 the everyday code for local homes, schools, and businesses. The code was created in 1999 after a split from 516 to keep up with growth across Long Island. Today, 631 works alongside overlay area code 934, so both codes cover the same region.
Major communities and landmarks in the 631/934 service area include:
Interesting facts: Suffolk’s coastline includes barrier beaches like Fire Island, popular for boating, surfing, and summer getaways, while the North Fork is known for vineyards and farm stands. Because of the 934 overlay added in 2016, 10-digit dialing is required for local calls within 631. Calls showing a 631 area code almost always trace to Suffolk County, including Babylon and its villages.
“Area code 934 overlaid 631 in 2016.” — North American Numbering Plan Administrator (NANPA)
“Suffolk County’s population was 1,525,920 in 2020.” — U.S. Census Bureau