The electrical conductivities of the dilute solutions containing ionic liquids (1-hexyl-3-methylimidazolium chloride [Hmim]Cl, 1-hexyl-3-methylimidazolium bromide [Hmim]Br, and 1-hexyl-3-methylimidazolium iodide [Hmim]I) with water and isopropanol were determined in the temperature ranging from 293.15 to 313.15 K. The liquid densities of all binary mixtures were further determined for model parameterization. In theoretical modeling, the limiting molar conductivities Λ⁰(T) were first obtained using the Debye-Hückel-Onsager (DHO) equation, and thereafter the ion association constants K_A(T) were determined using the Shedlovsky equation. The effects of temperature, dielectric constant, and anion size on the values of Λ⁰(T) and K_A(T) were systematically discussed. The Eyring activation enthalpy of charge transport ∆H^* and the Walden values Λ⁰η for all studied binary mixtures were obtained from the temperature-dependent Λ⁰(T).