In the competition held in St. Mary's County, Md., Martin, of Panama City Beach, and other competitors were judged on how quickly and completely they shucked 24 oysters, The Baltimore Sun reported.
Martin now has the opportunity to represent the United States in the international oyster-shucking competition in Ireland.
Four-time national champion Deborah Pratt of Jamaica, Va., fell short in her quest for a fifth title.
Pratt began shucking oysters in 1975 to support her children, The (Norfolk, Va.) Virginian-Pilot reported.
"I just went to work to make sure my kids had," she said. "I didn't want them not to have."