In the title compound, C13H27N4+·I−, the ethyl­ene bridge is distorted from the ideal D2d symmetry wherein an N—C—C—N planar bridge, around whose C—C bond the C—N and C—H bonds are exactly eclipsed, is disordered over two sites with equal occupancies. In both disorder components, the hexyl chain adopts an ideal all-trans conformation. In the crystal, adjacent ions are connected by C—H⋯I hydrogen bonds, forming ionic pairs that are further linked into chains along [101] via a second C—H⋯I inter­action.