There is a 20 yr. gap in the census records [1880 - 1900] as the 1890 census was burned in the 1920's. Add 20 yrs to everyone's 1880 age for the 1900 census.
I’m not related to any member of this family.
WHAT 'specific' family info. are you seeking???
Illinois Death and Marriage Databases – FREE and SEARCHABLEhttp://www.ilsos.gov/isavital/marriaggesrch.jsphttp://www.ilsos.gov/isavital/idphddeathsrch.jsp
Try Vital Records – Birth, Marriage, & Death, Social Security Info, Census Records – FREE ALL STATEShttp://search.labs.familysearch.org/