Census Links is a growing catalog of links to transcriptions of census, tax lists, birth, death, marriage and military records, all freely available to help with your genealogy research.
From the UsGenWeb Census Project
1850 Census, Black Hawk, Iowa
Transcriptions and index of portions of the 1860 Black Hawk Co, IA census. Some marriages and notes are included along with links and resources.
1896 to 1958 Births, Black Hawk County, Iowa
1920 Census, Black Hawk County, Iowa