The effect of electrolytes such as toluene-4-sulfonic acid sodium salt (T4SNa), dodecyl-benzene-sulfonic acid sodium salt (DbSNa), alzarin red S monohydrate, and dilute sulfuric acid and reaction parameters, including the monomer concentration, electrolyte concentration, applied voltage, and the reaction time, on the electrochemical polymerization of pyrrole onto carbon fibers was studied. The amount of polypyrrole coatings formed on the carbon fiber surface increased with increased monomer concentration, electrolyte concentration, applied voltage and reaction time, respectively, for each supporting electrolyte. However, the electrolyte concentration and applied voltage were shown to have a greater influence on the amount of polypyrrole coatings formed onto carbon fibers. Scanning electron microscopy micrographs show that the morphology of the coatings were dependent on the nature and concentration of the electrolyte. IR and elemental analysis of the coatings show that the counterion derived from the electrolyte was incorporated into the polypyrrole coatings. The elemental analysis of the coatings show that the ratio of pyrrole units to the counter ion is 2.64/1 for T4SNa, 2.79/1 for DbSNa, and 5.32/1 for sulfuric acid.