Term used in the Census Bureau to refer broadly to the retrieval of personal information from official records.  More specifically, it refers to what is available from decennial population census. 

U.S. Census Bureau, National Processing Center
1201 E. 10th St., Jeffersonville, IN 47132
Phone: (812) 218-3046

For further detailed information go to the Census Bureau’s web site.http://www.census.gov/genealogy/www/agesearch.html.