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Area code 6XX
Area codes 631 to 671
631 area code
: New York
617 area code
: Massachusetts
603 area code
: New Hampshire
609 area code
: New Jersey
646 area code
: New York
607 area code
: New York
610 area code
: Pennsylvania
667 area code
: Maryland
681 area code
: West Virginia
678 area code
: Georgia
615 area code
: Tennessee
662 area code
: Mississippi
601 area code
: Mississippi
606 area code
: Kentucky
614 area code
: Ohio
616 area code
: Michigan
641 area code
: Iowa
608 area code
: Wisconsin
651 area code
: Minnesota
612 area code
: Minnesota
605 area code
: South Dakota
630 area code
: Illinois
618 area code
: Illinois
636 area code
: Missouri
618 area code
: Missouri
660 area code
: Missouri
620 area code
: Kansas
682 area code
: Texas
602 area code
: Arizona
623 area code
: Arizona
626 area code
: California
657 area code
: California
661 area code
: California
619 area code
: California
650 area code
: California
669 area code
: California
684 area code
: American Samoa
671 area code
: Guam
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