Hello, I am the gggg-grdau of Susannah & Daniel Wiggins and I don't know her parents yet either! They were mar in Darlington Dist., SC, I believe, [going by memory here!] in 1798 and I'm going to try looking there for some info myself. I don't know if there was a census for that time period or not but I'll see.
Have you checked out Margie Wiggins Lawrence's webpage? Go to Wiggins genforum #1845 & click on the url and you'll find all the children with family members. Abijah Elijah is my line thru dau Martha Ann Frances....... My mom is thed/o George Franklin & Mary Frances Mathis Cameron of Henry Co before it became Houston Co Al.
Let me know if I can help you in any way and I'll keep searching for Suzannah's parents too and let you know if and when I find something.