Calling Sint Maarten from the United States explained:

• 1 - Country Code for Sint Maarten
• 721 - area code within the NANP
• local phone number - 7 digits
• US to Sint Maarten international dialing format: 1 721 ??? ????
• this country is part of the North American Numbering Plan - NANP (calling it works like a US state to state call)

Phone Books:

• Teledom - comprehensive commercial directory
• Telem Group Directory - interactive print like directory, features Yellow, White and Health Pages
• White Pages by UTS carrier

Updates:

• Sint Maarten telephone numbering changes - September 2011