In a couple of entries on Family Search, Thomas Willcox's birthplace has been shown as Ivybridge. Another birthplace given is simply "near Exeter." There is, in fact, an Ivybridge in Devon, England near Exeter, so I am researching this more.
Here is a fun brochure put together about this area which I am checking out.
Of interest to me is the mention of St. John's church. I am going to look there to see if I can find any official birth records.
A place to gather and share information about the Thomas Willcox and Elizabeth Cole Willcox Family of Ivy Mills, PA. For more information see the Home page link above or contact Deniane Kartchner at Denianek@gmail.com. My husband is a descendant of Thomas and Elizabeth's son James who married Prudence Doyle. Their son John's daughter Prudence married John Christopher Kartchner.
Note: This is a work in progress! I am trying to verify everything before I post, but feel free to send me corrections and/or suggestions. It’s also not a complete history of Ivy Mills or a website for current operations, although I will gladly try to answer any questions and/or lead you to the right information.