- 1840 Census
~This is the 1840 Menard Co census, which at that time included the southern half of current-day Mason County. The northern half of Mason was enumerated with Tazewell Co. but is not currently online.
- 1855 State Census
- 1870 Federal Census
- 1880 Census at FamilySearch.org
~Searchable database, offsite
- 1874 Subscribers Record
Not an actual census, but contains a listing of subscribers to the 1874 "Illustrated Atlas Map of Mason County" and includes name, residence, place of birth and year came to county
- 1917 Farmers' Directory
Much like a mini-census, it gives the name of each farmer, name of wife and children, year they came to the county, address, whether they own or rent their farm, and more.
For an explanation of names of diseases listed in the mortalityNon-Population Schedules
schedules, visit Olive Tree Genealogy (offsite link)