858 members make up the Ulster Unionist Council.
650 members from the 18 Westminster constituency associations: 14 party officers: 10 Members of Parliament; 27 Assembly Members; 120 representatives of the Orange Order; 34 members of the UU Women's Council; 34 members of the Young Unionists' Council; 26 members of the UU Councillors' Association; 5 members of the Queen's University Unionist Association; 5 Lords; 12 members co-opted from other party bodies.
A number of positions overlap, for example, Mr David Trimble is entitled to council membership as leader, an MP and an Assembly member but he gets a single vote.