I have a John Bradbury, born 1830, the youngest of 12 children of John and Mary Locke Bradbury. Mary was John's 2nd wife (Alice Tyler Hollis was first, with 2 children). John the father was the son of Joseph and Patience Goodwin Bradbury. Joseph and son John were born in Buxton Maine. I don't have any information on the birthplace of any of the children. Hope this might help.
I also have a John W. Bradbury born 12/22/1827, the son of Samuel and Sally Leighton or Laughton Bradbury. Samuel was born in York Maine.