There is an understandable concern among practitioners of education, academic analysts, policy formulators, and curriculum designers that a large number of government officials have both neglected and ignored the salient topic of the changing demographics of Nigeria and of Delta State (NPC, 2007). The economic upturn of Nigeria and in particular Delta State in the past decade has given rise to significant developments in business, construction, and an influx of new residents (UNDP, 2008). For better planning, development, and management of human population and national resources, the knowledge of the population of a nation is indispensable. Population management entails the processes and procedures involved in the acquisition, storage, retrieval, analysis, and dissemination of appropriate information designed to manage the human resources of the people(s) living within a particular geographical entity, Ayeni & Adewale (2001). Ayeni & Adewale (2001) opine that the implementation of an effective population management system will determine to a large extent how to better plan and manage the future changes that are bound to occur as a result of an increase or decrease in population. Such population management system is the Geographic Information Systems (GIS), a system designed for the capturing, storing, checking, retrieving, integrating, analyzing, and displaying spatial information. This researcher explored the opportunities provided by Geographic Information Systems to engage the future of Nigeria, Delta State and the Catholic dioceses of Delta State in a critical manner capable of steering development, territorial planning, and improvement of the quality of life. The sample for this dissertation is 140 million Nigerians counted in the 2006 national census based on population, age, birthrate, employment, housing, income, and level of education. Analyses of the data are reported using Hughes' descriptive, comparative, summative model and also on his method of five Cs: Content, Contrast, Compare, Context, and Construct. Data are presented through MapInfo to enhance the accuracy of analysis. The results indicate that, if optimally applied, Geographic Information Systems stand to enhance planning, decision-making, policy formulation, resource allocation and developmental programs of government and non-governmental organizations. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com/en-US/products/dissertations/individuals.shtml.]