Dhaka, one of the South Asian megacities is facing incredible problems associated with population. Rural to urban migration remained the most dominant factor of the population growth. This book addresses only the increasing population of Dhaka city in future decade. Predicting future populations and their structure is a central theme in demography. This book therefore provides a better idea about the increasing population of Dhaka city based on a population model which is a first order ordinary differential equation known as Malthusian Population model or Exponential growth model, where the growth rate are modeled as a linear function of time and also what will be the future population of Dhaka city .We project the future population of Dhaka city for the next several years with the help of least square growth rate profile which is used to compute estimations of parameters and to fit data. It is found from the study that the least square growth rate procedure gives most accurate approximation.