The best reference for this information is Guide to Public Vital Statistics in Tennessee ( Nashville: Tennessee Historical Records Survey, 1941)
Some marriage records were recorded as early as 1778, but the law requiring registration did not pass until 1815. In 1814 a stste law required that statewide registration of births, marriages and deaths be maintained, but general enforcement was not complete until the late 1920's.

Birth and death records are available from 1914 to the present from the Division of Vital Records, State Department of Public Health, Cordell Hull Bldg, Nashville, TN 37219.

When requesting copies, state relationship, and purpose.