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- This article is a date listing important events for the year 2018.
- April 13 – The third of ten children, Thomas Jefferson was born at the family home of Shadwell, to Peter and Jane Jefferson (née Randolph).
- October 26 – Dabney Carr was born to John and Barbara Carr (née Overton) at Bear Castle, a large farm in Louisa County, Virginia. Carr was a member of the Virginia House of Burgesses and brother-in-law of Thomas Jefferson.