Electrical properties of polypyrrole/sulfated poly(beta -hydroxyethers) (PPy/sulfated PHE), wherein the sulfated hydroxy groups in the latter component worked as dopants, were investigated, varying the doping level as well as the PHE molecular mass (M-n). The blends can be categorized into three groups: the slight-, moderate- and high-sulfation. In the moderate-sulfation, the charge transport above 80 K is characterized by the two-dimensional variable-range hopping (2D-VRH) through the PPy conducting channels formed on the surfaces of coiled PHE. In the high-sulfation, the dimensionality of the VRH changes from two to three. In addition, the carriers in the metallic states also participate in the charge transport. In the slight-sulfation, the hopping to the nearest neighbors operates in addition to the 2D-VRH. For all the samples, the dominant conduction below 80 K is the hopping governed by a Coulomb gap due to the electrostatic interaction between carriers. The change in the doping level causes the transition from one sulfation group to another when M-n is large, whereas most blends are categorized into the moderate sulfation group when M-n is small. This behavior is interpreted, considering the M-n dependence of the spatial distributions of the PPy in the PPy/PHE blends.