There were no ANTHONY Marriages in Person County at all. As a matter of fact, 1820 was the one and only time there were any ANTHONYs in the Person Co. Census until the year 1900; MRS. NANCY ANTHONY was the only one in 1820, although she was listed twice for some reason, apparently in different parts of Person Co. I notice in the Census there were a few ANTHONY families in Caswell and Orange Counties, two nearby Counties, perhaps she had lived in one of those before coming to Person. Also, since she was showing as born in VA, it is likely that she came from one of the nearby border Counties in Virginia, and perhaps she was even married in that State, too. You may need to do some further research in each of those locations to find out where she may have come from.