IMO Smith County. Found on Find a Grave, a reference to Hillsdale.
Rev Hiram Casey
following is from
Grime, J.H., History of Middle Tennessee Baptists (Nashville, TN: Baptist & Reflector, 1902)
first twelve years of his ministry ( from 1812 to 1824 ) in Smith and surrounding counties in Middle Tennessee. Part, if not all, of this time his home was on Goose Creek, near Meadorville. His membership was probably with the church then known as East Fork Goose Creek, now known as Hillsdale Baptist church.
Bible and Tombstone Records, Smith County, Tennessee. ...... at the East Fork of Goose Creek Baptist Church when the area was still part of Smith County.