This is a Message Board Post that is gatewayed to this mailing list. Classification: Query Message Board URL: http://boards.ancestry.com/mbexec/msg/an/Zg.2ADI/42.1 Message Board Post: I know this is a really old question, but I came across it because I was in the exact same situation. It took me several hours to find the answer, so I thought I'd post it to help out anyone else who might need it in the future. I found a McHenry County Fact Sheet at: http://www.cyberdriveillinois.com/departments/archives/irad/mchenry.html which says that Byron was renamed Dunham in December of 1850, about 2 months after the census was taken. At the same time, Benton was changed to Burton, Centre to Dorr and Brooklyn to Nunda.