Prefix Information

The prefix 640 is part of area code 301 serving Bethesda, Maryland.

This exchange contains 10,000 possible phone numbers (301-640-0000 through 301-640-9999).

Browse Numbers in This Prefix

301-640-0000-0999 301-640-1000-1999 301-640-2000-2999 301-640-3000-3999 301-640-4000-4999 301-640-5000-5999 301-640-6000-6999 301-640-7000-7999 301-640-8000-8999 301-640-9000-9999

Sample Numbers

(301) 640-0000 (301) 640-1234 (301) 640-2000 (301) 640-3333 (301) 640-4444 (301) 640-5555 (301) 640-6000 (301) 640-7777 (301) 640-8888 (301) 640-9999