Marketing Information System is a computerized system that is designed to provide an organized flow of information to enable and support the marketing activities of an organization. The main aim of this study is to develop and implement an online marketing system that will be useful to business owners. In achieving this aim, the following specific objectives were laid out to create a platform for businesses to reach a wider audience and increase sales and profits, develop a general purpose store where consumers can find products and services from the comfort of home through the Internet, and implement an online virtual store on the Internet where customers can browse the catalog and select products of interest. One of the major problems Business Marketing face in their campaigns is still the use of primitive promotions channels such as press, brochure, catalogue, TV, cell phone, etc, and several offline channels which lacks a comprehensive, harmonizing marketing framework. In this project work, we present a new solution for businesses to promote their business online to reach a wider audience. The methodology adopted in this study is the object oriented analysis and design methodology (OOADM) which is a technical approach for analyzing and designing an application or system by applying object throughout the software development process. The programming language used is HTML, CSS, JAVASCRIPT, PHP, SQL and JQUERY. The reason why web programming languages was used is because, it is platform independent and it is a web based application. This project will be of benefit to: Enterprises, Shopping Malls/Supermarkets and many large companies like; waste companies, and Power holding companies. The expected result is an Online Marketing Information System that will process customer’s selected items in a shopping mall or supermarket, and the system will generates an accurate bill for payment purpose.