USGenWeb is non-commercial and fully committed to free genealogy access for everyone.
USGenWeb is arranged by county and state. The Illinois section is called ILGenWeb.
Partial transcriptions and scans of the 1850 amd 1930 census for Cook County are available.
You can request a lookup of the pqarts that have not yet been transcribed by e-mailing CENSUS-CHATfirstname.lastname@example.org.
You can also vounteer to transcribe a section in which you are interested.