Credit Union Access
Provides a searchable listing of all U.S. credit unions, includes financial information on each.
http://creditunionaccess.com

Credit Unions Online
A state-by-state and alphabetical listing of credit unions in the United States and worldwide.
http://www.creditunionsonline.com/

NCUA Credit Union Directory
United States credit unions listed by city and state, available as text or PDF files.
http://www.ncua.gov/data/directory/cudir.html

USA Credit Unions
Listing of credit unions by state and city. Offers name address and phone, but no web link.
http://www.2creditstreet.com/