Tennesse Marriage Look-up - Blount County, 1875

I'm looking for a record of the marriage of William Vaughn and a Mary J in or around 1875. They were living in Blount Country, Tennessee in the 1880 census and the 1900 census, so I'm guessing they were most likely married in the area as well. In the 1900 census it mentions they were married 25 years, so I am putting their estimated marriage year around 1875.

Their information:

William Vaughn: April, 1848
Birthplace: Tennessee
Parents birthplace: North Carolina

Mary J: April 1860
Birthplace: Tennessee
Parents birthplace: South Carolina

Thank you very much! I'm not familiar with what records are available, so I am hoping that someone may be able to find something!