Aerosol spray insecticides are widely available in Indonesia's public market to control the German cockroach population, but the reports on their effectiveness are still limited. This study aimed to determine the efficacy of six pyrethroid insecticides in the form of aerosol sprays (By, Ht, Vp, Nm, Mt, and Fm) against field German Cockroaches populations in Indonesia (Palembang and Bukittinggi populations). Five insecticides effectively paralyzed the Bukittinggi population and ineffective to the Palembang population by the knockdown time (KT90) criteria. All aerosol insecticides were ineffective in killing Bukittinggi and Palembang Cockroaches populations by the lethal time (LT90) criteria. The pyrethroid insecticides sold in the public market were no longer effective in killing the German Cockroaches population. The results show a high level of resistance in two German cockroach populations in Indonesia.