From the record
“Williams House, also known as the John Wilson Williams House, is a historic home located near Ulmer, Allendale County, South Carolina. The house consists of a residence built about 1800, with an addition built about 1906.”
Wikipedia article Williams House (Ulmer, South Carolina), CC BY-SA 4.0.
One of 10 National Register listings published here for Allendale County · listed in 1999 · category: Building.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service · the Wikipedia article