Telephone Directories for Canada

Canada 411: Canadian residential and business numbers. Includes reverse lookup
Canada Tollfree: directory of toll-free numbers
Canada Yellow Pages: search by name or type of business
myTELUS: business finder, people finder and BC Blue pages. Includes reverse lookup
Superpages: Canadian residential and business numbers
Zip411: Canadian business search by name, category or toll-free numbers

Telephone Directories for the US

AT&T AnyWho: white and yellow page lists.
AT&T Tollfree
Big Yellow: yellow page listings for the US
Superpages: find US businesses with maps and driving directions
Infospace US People Finder
Lycos WhoWhere: white pages search
Switchboard: allows you to enter an address, and will list nearby business. Includes White and Yellow Pages, and maps

Reverse Look-up Directories

Click411.ca : includes addresses and phone numbers
Infobel Canada Reverse Look-up: includes addresses and phone numbers
Infospace Reverse Look-up: for the US
Yellow.ca: includes reverse look-up by phone for businessess in all of Canada


International Telephone Directories

International Calling Codes
Infobel International Telephone Directories
Australian White Pages Directory
Australian Yellow Pages Online
France Telecom White and Yellow Pages
Teleauskunft : white and yellow pages for Germany, plus an email search
New Zealand White Pages
Ask Alix: British business directory
The Phonebook: official British Telecom white pages for the UK, includes both people and businesses; covers England, Scotland, Northern Ireland, Wales, and the Isle of Man
BT Yellow Pages: British yellow pages

Postal Codes

Canada Post Postal Code Lookup
PostInfo: links to postal code lookup sites from various countries
UK Postcode Search: from the Royal Mail, registration required
US Zip Code Lookup Services
Zip Code Lookup: a reverse zip code lookup, enter the zip to search for the place