The Source: A Guidebook of American Genealogy edited by Loretto Dennis Szucs and Sandra Hargreaves Luebking (Ancestry), a reference work with a chapter on research in census records.

The Census Book: A Genealogist's Guide to Federal Census Facts, Schedules and Indexes by William Dollarhide (Heritage Quest), which reviews census schedules and identifies all known census indexes.

Map Guide to the U.S. Federal Censuses, 1790-1920 by William Dollarhide (Genealogical Publishing Co.), with maps showing state, territorial and county boundaries for all states for each census year.

First Steps in Genealogy by Desmond Walls Allen (Betterway Books,), a beginner's guide with information on locating and using census records.

Historical Statistics of the States of the United States compiled by Donald B. Dodd (Greenwood Publishing Group), which tracks historical trends based on 18 census data items.

Population of States and Counties of the United States: 1790-1990, From the Twenty-One Decennial Censuses (US Government Printing Office)