There is a difference between population geography and demography though both, population geography and demography, are concerned with human population and its growth over the time. Both these can be regarded as sub-study fields of Sociology. Demography is the statistical study of the human population. Demography studies the growth of population and the size, structure and distribution of this growing population. Population geography is the study of the division of humans over geographical factors. This area is interested in studying the population growth patterns related to natural living places. However, both study fields focus on human population and its growth, in different dimensions