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Poly(o -methoxyanilines) (POMA) were chemically synthesized using different dopant acids to obtain the polymers POMA/HCl, POMA/HNO 3 , POMA/H 2 SO 4 and POMA/H 3 PO 4. The nature and size of the counterions influenced considerably on the structural, morphological, thermal and electrical properties of the as-synthesized polymers. X-ray Diffraction (XRD) patterns presented slightly peak displacements according to the dopant acid, influencing the lattice parameters specially along [010]. The polymers POMA/HCl, POMA/HNO 3 and POMA/H 2 SO 4 presented similar percentage of crystallinity (around 50%), while the polymer POMA/H 3 PO 4 presented de lower crystallinity (around 40%). Polymer morphology was dependent on the dopant acid, besides multimorphologies were observed in the polymers POMA/HCl, POMA/HNO 3 and POMA/H 3 PO 4. A great counterion influence from the doping acid was found in the electrical properties of the material. The total variation obtained in DC conductivity was five orders of magnitude. The calculated values were 6.6 × 10−1 S/cm, 1.11 × 10−2 S/cm, 3.64 × 10−3 S/cm, 5.2 × 10−4 S/cm for POMA/HCl, POMA/HNO 3 , POMA/H 2 SO 4 and POMA/H 3 PO 4 , respectively. The use of HCl as a dopant potentiated the DC conductivity of the polymeric material. Image 1005 • X-ray Diffraction patterns presented peak displacements according to the dopant acid. • Polymer morphology was dependent on the dopant acid. • Crystallites reached a maximum average size. • Electrical conductivity of POMA/H 3 PO 4 was dependent on the frequency. • The use of HCl potentiated the DC conductivity of the polymeric material. [ABSTRACT FROM AUTHOR]