The solubility, density, and refractive index of 1,2-propanediol + KBr + H2O, ethylene glycol + KBr + H2O, and glycerin + KBr + H2O ternary systems are determined at 288.15, 298.15, and 308.15 K. In all cases, the solubility of KBr decreases with increasing concentration of polyhydric alcohol. The liquid-solid equilibrium experimental data are correlated using the nonrandom two-liquid (NRTL) activity coefficient model, considering nondissociation of the dissolved salt in the liquid phase, and new interaction parameters are estimated. The mean deviations show a good applicability of the NRTL model. Simultaneously, the corresponding unsaturated systems are investigated, and the concentration factors are discussed.