Illinois, County Marriages, 1810-1940 Description Index of county marriages from the state of Illinois. Additional records will be added as they are completed. How to Use this Collection » Search Collection View Images in this Collection Browse through 654418 images Citing this Collection "Illinois, County Marriages, 1810-1940." Database with images. FamilySearch. http://FamilySearch.org : 21 January 2021. County offices, Illinois.