Sussex County Cricket Club is one of the 18 member clubs of the English County Championship, representing the historic county of Sussex. Although Sussex representative sides had been playing cricket since the mid-eighteenth century and had also played first-class cricket matches since 1815, the County Cricket Club was established on 1 March 1839. They have played first-class matches since 1839, List A matches since 1963, and Twenty20 matches since 2003. The County Ground and Arundel Castle are the only two grounds to have hosted Sussex Twenty20 matches.