This paper identifies areas with high and medium population density as risk areas that require urgent attention. Increase in high population density has been the bedrock of high pressures on existing facilities, high rate of crime, traffic congestion, easy spread of communicable diseases, environmental pollution which can also lead to emergence of environmentally oriented diseases such as cholera. Solutions to those problems could enhance peaceful coexistence among citizens and can pave way for national reconciliation and integration. The 1991 and 2006 population and housing census data was used in the study. Cartographic representation method was the methodology used. Thematic maps of Nigeria to show spatial distribution of risk areas were produced using ArcView 3.0 GIS. The result shows that eleven (11) areas were identified as risk areas and the population density of Lagos state will rise to 4,281 persons per square mile by 2021 and by 2036 it will reach 5,441 persons per square mile. In the other risk states, it will rise to 1,201 by 2021 and 1,521 persons per square mile by the year 2036. An altitudinal urban expansion, provision of un-interrupted power supply and agricultural revolution were among the suggestions offered.