Area Codes Map
See where area codes fall on the map.- Country Calling Codes
Get country and city codes. - HowToCallAbroad.com
International calling guide. 
ReferenceUSA
Nationwide business and residential listings.- Switchboard.com
Another place to look for business and residential phone numbers. - ZIP Code Lookup and Address Information
Enter an address and get the ZIP code. 
D and B Million Dollar Database Premier
U.S. businesses and manufacturers with 20 or more employees.
More research tools
- All Databases A-Z
- Library catalog
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