Reference USA From: BPLonline | November 04, 2009 | 105 views A tutorial on using the Reference USA Database. ReferenceUSA is useful for finding both people and businesses by name, address, city, state, phone number. ReferenceUSA proviides address and telephone listings from more than 13 million United States businesses and 120 million residences. For businesses, ReferenceUSA provides basic contact information as well as estimates of sales and number of employees. Residential listings include phone and address information as well as United States Census data such as median household income, median home value, latitude/longitude and percentage of owner-occupied housing in the area.