Background: Improvements made by Anglo-Iranian Oil Company in Masjid soleyman and Abadan cities, as well as rapid modernization of oil producing countries of the Persian Gulf such Kuwait and Qatar in contemporary history, promoted these regions from unimportant and trivial places into prosperous, attractive, and abundant ones. These changes raised expectations that due to the key role of oil industries in national economy, and social responsibilities expected from the oil industries, they are supposed to have the same positive effects on the other regions where oil industry sites are located, and such locations should have experienced drastic changes towards abundance and development by overwhelming incomes of the oil. In this way, the main goal of this research is to analyze positive or negative effects of Bahregan Offshore Oil Company on the three ports of Deilam, Imam Hasan, and Genaveh which are close to this Company’s installations. The research method is descriptive-analytic, using documentation, library, field research, and unwritten history techniques. Analyzing available evidences and statistical data shows that Bahregan offshore oil industry has failed in leaving the same effects on the a.m. three ports as those positive improvements made with Masjid soleyman and Abadan cities by oil industries, and that the improvements found in the cities studied in this research do not demonstrate direct and meaningful relevance with oil industries. This failure could be traced down upon different features of Bahregan offshore oil industry in comparison with the previous ones, lack of interaction with its surrounding local society, and changes in the organization strategies of the Oil Ministry for investment in the regions off the limits of oil industries. Meanwhile, it has been found that the majority of economic improvements in the northern ports of the Persian Gulf in the age of Pahlavi II has been due to the new regional changes and increase in maritime trade of the