Brentwood, NY Area Codes

Area codes serving Brentwood

Brentwood sits in New York, part of the Northeast region and the Eastern Time zone. Its numbers are spread across an overlay of 2 codes that all cover the same ground: 631, 934.

The original code is 631 (in service since 1999). As the area ran low on numbers, regulators added overlay codes on top instead of splitting the city, so longtime residents kept their numbers while new lines received a newer code.

Code	Area served	In service
631	Suffolk County on eastern Long Island, including the Hamptons	November 1, 1999
934	Suffolk County on eastern Long Island, including the Hamptons	July 16, 2016

Nearby cities sharing these area codes

• Huntington
• Islip
• Central Islip
• Smithtown
• Commack
• Bay Shore
• Lindenhurst
• Patchogue
• Babylon
• Stony Brook
• Port Jefferson
• Riverhead
• Southampton
• East Hampton

How to pick an area code for a new number

When you activate a new line in Brentwood, the carrier assigns whichever code has numbers available — you usually can't choose. If a specific code matters to you (for example the prestige of 631), ask the carrier whether any blocks remain, or request a number transfer. All codes here dial identically and cost the same.

Dialing in Brentwood

Because Brentwood is an overlay area, 10-digit dialing is mandatory: always dial the area code plus the seven-digit number, even for a neighbor. See 10-digit dialing and overlay area codes for the background. For every code in New York, visit the New York area codes page.