I am looking for information on Dennis Carroll and his wife Mary, both born in Ireland, he about 1817. They probably emigrated in the early 1850's. According to census information, the following children were born in Illinois in the 1850's and 1860's: Bridget, Ellen, Daniel, Mary Ann, Dennis, and Johanna. They are living in Erin at the time of the 1870 Census. I cannot find Dennis or Mary in the 1880 census so it is possible they died in the 1870's. I find only Daniel, who is married to a Mary Ann, living in Erin in 1880. His sister Johanna is living at the same address. I would like to find Dennis's death record to see what his parents' names are. I cannot find Dennis or Mary in the index that has been archived so possibly they died before 1878. Is there some way I can learn if Dennis died in the 1870's? I could then send for a death certificate. Thank you for any help.