Population density in the world exhibits variations on regional basis. In those regions of the world where distribution of population is more, density is also found to be more there. The level of population density in the entire world exhibits significant variations. At some places in the world, density is 1 person per sq. km., and at other places, it is upto 7797 persons per sq. km. On the basis of these diversities, the world is mainly divided into the following parts with the point of view of population density:

1. Very high density regions 

2. High density regions

3. Normal density regions 

4. Low density regions 

5. very low density regions

1. Very High Density Regions: 

Those areas of world where population density is found to be above 250 persons per sq. km. are included in this category. In this part, world’s three agglomerations are included –

• east, south, and south east Asia. 
• western and central Europe. 
• North – east America.

Due to favourable condition of climate, plain surface, fertile, soils, water, minerals, modes of transportation, there is high density.

2. High Density Regions: Those regions of the world, where population density is 101-250 persons per sq. km. are included in this part. Mostly, neighbouring regions of very high density regions are included in this category. Southern, southern-eastern and eastern Europe, central and northern America, coastal area of South America and Africa, internal parts of south – east Asia, north – western China, central India and southern Australia are included in this category.

3. Normal Density Regions: Those areas of world where population density is found to be between 10-100 persons per sq. km. These are included in this category. Such as grassland areas of Asia, Africa, and South America. Instable agriculture, livestock, forestory and agriculture near desert area are included.

4. Low density Regions: Those areas of world where population density is found to be between 1-10 persons per sq. km. Sudan in Africa, Libia, Malagasi, Canada in North America, North Argentiana in South America, Peru, Equador, West Siberia in Asia, Bornio etc. are included in this category.

5. Very Low Density Regions: Those areas of world where population density is found to be below 1 person per sq. km. are included in this category. 70% area of earth’s land is included in this category. World’s very cold Tundra regions, very hot equatorial regions, very dry desert regions and highly mountainous regions are included in this category.