Census

What is collected? An excellent aid regarding the U.S. Census information from 1790 through 1930 is offered by Genealogy.com

Union County Illinois Federal Census Records include: 1820, 1830, 1840, 1850, 1860, 1870, 1880, 1900, 1910, 1920, 1930 and 1940.

1890 Union County Illinois Federal Census Records (including the Veterans and Widows census) were completely destroyed by a 1921 warehouse fire.

1850 Mortality list

Searchable collections by FamilySearch:

1818 Illinois State Census is available free online at Access Genealogy
    Union County -
        A-D Surnames
        E-K Surnames
        L-R Surnames
        S-Z Surnames

Union County, Illinois State Census is available free online at New Horizons Genealogy 1820

All of the census records are available free online at Archive.org. You can read and even download the massive files.

Templates in Time