I am not sure I follow. D&B data is a product you purchase, at a steep fee. The census bureau also has data on businesses, as well as local Chambers of Commerce, Economic Development authorities, etc.
You can also pull the disclosure statements data of banks that have submitted for CRA from the FFIEC site.
http://www.ffiec.gov/cra/craproducts.htm I am assuming you do not mean where to pull your bank's data, but I couldn't tell from the question.