I have just started researching my husband's Chamberlain/Russell line. Both families come from Posey Co. and the couple were married there in 1820. However, one place listed them as living in Evansville, Posey Co. On my 1999 AAA map of IN, it shows Evansville as being in Vanderburgh Co. Was there a split and how recent was it? Appreciate any help. Vicky Cannon