My GGG Grandmother died in Benton County in 1871. Any chance there would be a death certificate to be found? Trying to find her mother's maiden name.

Mary Ash (b. 1795 in Chelsea, Middlesex, England / d. 19 April 1871 in Monroe, Benton, Iowa, USA)
Married to Anthony Rampton (b. 1790 in England / d. 6 May 1878 in Monroe, Benton, Iowa, USA)

Thank you!