USGENWEB Census Project
http://www.usgwcensus.org/

Census-online Gladwin
http://www.census-online.com/links/MI/Gladwin/

1860 Unorganized Gladwin County Census

Library of Michigan 1870 Census Index
http://www.hal.state.mi.us/1870census

LDS Family Search (1880 Census)
http://www.familysearch.org/Eng/Search/frameset_search.asp

1890 Eleventh Census of the United States
Special Schedule
Surviving Soldiers Sailors and Marines, and Widow, Etc.

1894 Census of the State of Michigan – Gladwin County Volume 1