This study looked at marketing as a solution for the growth and sustainability of the Port Harcourt metropolitan' economy. The field of marketing is at the forefront of advancing the interests and well-being of consumers in the business sector and members of an economic community. From its original function of purchasing, selling, and distributing goods and services from producers to consumers, it has gradually evolved into a unique and amazing phenomenon with achievements in the fields of government, business, industry, healthcare, education, and other areas of life. The level of living for citizens has significantly increased as a result of these achievements. Two inhabitants of the Port Harcourt metropolitan area, which includes the Port Harcourt and Obio Akpor Local Government Areas of Rivers State, served as respondents for this quantitative study. Marketing activities and economic growth, particularly through marketing opportunities, have a strong connection with the various dimensions, according to the data gathered and analysed. Marketing activities encompass a wide range of business opportunities that anyone can pursue to make a living, including research, advertising, sales promotion, purchasing and selling, and warehousing. In conclusion, it can be claimed that contemporary marketing significantly influences the city of Port Harcourt's economic development and progress. Based on the results, we suggest that marketing research be promoted in order to sell products that will increase the city of Port Harcourt's economic activity.