I have found William and Mary in the 1850 Wilkes County, NC census. I know for sure that they lived there at that time. There is only one William Warren listed. His wife was listed as Polly. Her name must have been Mary Polly - Polly Mary - or Polly could have been a nickname for Mary. The person who took the census put down the county where they were born instead of the state, country or territory. Both William and Mary (Polly) were born in Wake County, NC. It also lists them both as 69 years of age. This would make them both born in 1780. We originally thought that Mary was born in 1788.