It happened late Sunday night at the store on the 800 block of S. Dupont Highway.
Police say a man wearing a black knit mask entered the store and displayed a large hunting knife to a 52-year-old female clerk.
The robber fled the scene with money and several packages of cigarettes.
Anyone with information on this crime should contact County Police or Crime Stoppers.
This material may not be published, broadcast, rewritten, or redistributed.