Prefix Information
The prefix 400 is part of area code 516 serving Hempstead, New York.
This exchange contains 10,000 possible phone numbers (516-400-0000 through 516-400-9999).
Phone numbers with prefix 400 in area code 516. Location: Hempstead, New York.
The prefix 400 is part of area code 516 serving Hempstead, New York.
This exchange contains 10,000 possible phone numbers (516-400-0000 through 516-400-9999).