Electrical conductances of tetraalkylammoniurn iodides, R(4)NI (R = pentyl to heptyl) have been measured at 298.15 K in low-permittivity mixtures of 1,4-dioxane (epsilon = 2.21) and tetrahydrofuran (epsilon = 7.58). Minima in the conductometric curves (Lambda versus root c) were observed for electrolyte concentrations dependent upon both the electrolyte and the binary solvent mixture. The conductance data have been analyzed by the Fuoss-Kraus theory of triple ions. A numerical evaluation of ion-pair and triple-ion formation constants (K(p) and K(T)) was made, and the results have been discussed in terms of a molecular scale model.