555-1212.com – Phone, email, web and reverse (criss-cross) directory for residences and businesses. Subscription required
Associations on the Net – Collection of over 2000 Internet sites providing information about a wide variety of professional and trade associations, cultural and art organizations, political parties and advocacy groups, labor unions, academic societies, and research institutions
VeriZon (Big Yellow) Online Yellow Pages – Nationwide search for telephone numbers by geographical location or service/product available. Also links to people finders, job opportunities, maps, and direction finders
YAHOO People Pages – Metasearch by individual name and/or business for telephone numbers and email addresses
Switchboard.com – Nationwide directory of phone numbers and email addresses by individual, business, or product name. Maps available also.