Alcove 9: An Annotated List of Reference Websites

Addresses and Telephone Numbers

Switchboard (U.S. Telephone Directory)
Online database of U.S. residential and business telephone numbers, maintained by American Business Information.

Telephone Directories on the Web
Databases for searching foreign telephone numbers, arranged by country.

U.S. Postal Service ZIP Code Lookup Tools
Find a ZIP+4 code for a specific street address or business; search for ZIP codes by city or town; or search for localities in a ZIP code area.