Shamrock Acres is a Century Farm established in Coffee County, Tennessee in 1818 by Margaret McMichael of Ireland. Margaret McMichael chose 180 acres (0.73 km2) along the present-day Cheatham Springs to Fairfield Road because it was an “uneven landscape so like Ireland fertile bottom land.” She and her five children’s chief agricultural products were corn, wheat, hay, fruit, garden vegetables and livestock.
In 1846, Margaret’s son William McMichael and his wife Sophronia Ross inherited the farm. During the Civil War, five of their sons fought for the Confederate army. The precise record of the family ownership after William and Sophronia is uncertain. However, in 1935, Leona McMichael and her husband Dallas L. Jacobs acquired Shamrock Acres at a size of 266 acres (1.08 km2). As of 1976, they had added 107 acres (0.43 km2) to the property and currently produce corn, wheat, soybeans and cattle.