The 1790 federal census is posted at the following address: ftp://ftp.rootsweb.com/pub/usgenweb/nc/rowan/census/1790.txt
It shows a Joseph Bowen, and a William Bowman, in Rowan County. I will keep looking through some of my other stuff and will let you know if I come up with any other info. By the way, Davidson County was part of Rowan. Davidson was not created until 1822, with county seat at Lexington.
I will check Carolina Cradle in the next couple of days and see if Bowen or Bowman comes up.