Illinois Census online research should begin with what is available online for free. If this proves fruitful then congratulations! If not, then I would suggest signing up for the online census images (links to the right) where you can access all the available online Illinois census information directly from your computer at home.
- Illinois 1850 Census Records
- Illinois 1860 Census Records
- Illinois 1870 Census Records
- Illinois 1880 – 1890 Census Records
- Illinois 1900 -1930 Census Records
1820 Illinois Census
- Bond County 1820 Federal Census hosted by USGenWeb Census Project
- Clark County 1820 Federal Census hosted by USGenWeb Census Project
- Crawford County 1820 Federal Census hosted by USGenWeb Census Project
- Franklin County 1820 Federal Census hosted by USGenWeb Census Project
- Gallatin County 1820 Federal Census hosted by USGenWeb Census Project
- Jackson County 1820 Federal Census hosted by USGenWeb Census Project
- Jefferson County 1820 Federal Census hosted by USGenWeb Census Project
- Madison County 1820 Federal Census hosted by USGenWeb Census Project
- Monroe County 1820 Federal Census hosted by USGenWeb Census Project
- Pope County 1820 Federal Census hosted by USGenWeb Census Project
- St. Clair County 1820 Federal Census hosted by USGenWeb Census Project
- Union County 1820 Federal Census hosted by USGenWeb Census Project
- Washington County Federal Census hosted by USGenWeb Census Project
- Wayne County 1820 Federal Census hosted by USGenWeb Census Project
- White County 1820 Federal Census hosted by USGenWeb Census Project
- See Census Images Online for ALL Counties!
1825 Illinois State Census
1830 Illinois Census
- Clinton County 1830 Federal Census hosted by USGenWeb Census Project
- Gallatin County 1830 Federal Census hosted by USGenWeb Census Project
- Greene County 1830 Federal Census hosted by USGenWeb Census Project
- Hamilton County 1830 Federal Census hosted by USGenWeb Census Project
- Jefferson County 1830 Federal Census hosted by USGenWeb Census Project
- Macoupin County 1830 Federal Census hosted by USGenWeb Census Project
- Peoria and Putnam Counties 1830 Federal Census hosted by USGenWeb Census Project
- Perry County 1830 Federal Census hosted by USGenWeb Census Project
- Pike County 1830 Federal Census hosted by USGenWeb Census Project
- Sangamon County 1830 Federal Census hosted by USGenWeb Census Project
- Washington County 1830 Federal Census hosted by USGenWeb Census Project
- See Census Images Online for ALL Counties!
1835 Illinois State Census
- Union County 1835 Census hosted by USGenWeb Census Project
1840 Illinois Census
- Gallatin County 1840 Federal Census hosted by USGenWeb Census Project
- Greene County 1840 Federal Census hosted by USGenWeb Census Project
- Hamilton County 1840 Federal Census hosted by USGenWeb Census Project
- Jefferson County 1840 Federal Census hosted by USGenWeb Census Project
- Macoupin County 1840 Federal Census hosted by USGenWeb Census Project
- Peoria County 1840 Federal Census hosted by USGenWeb Census Project
- Perry County 1840 Federal Census hosted by USGenWeb Census Project
- See Census Images Online for ALL Counties!