| Term | Definition |
| arithmetic population | The population of a country or region expressed as an average per unit area. The figure is derived by dividing the population of the areal unit by the number of square kilometers or miles that make up the unit. |
| census | A periodic and official count of a country's population. |
| demography | The study of patterns and rates of population change, including birth and death rates, migration trands, and evolving population distribution patterns. |
| density | A description of the quantity per unit area of a given object or living organism. |
| distribution | The locations on the Earth's surface where individuals or groups live. |
| megalopolis | Term used to designate large coalescing supercities that are forming in diverse parts of the world. |
| physiologic population density | The number of people per unit area of arable land. |
| population concentration | Places where the most people are usually found. |
| population data | Data that tells how many people are in an area. |
| population density | A measurement of the number of people per given unit of land. |
| population geography | A subdivision of human geography that focuses on the spatial aspects of demography and the influences of demographic change on particular places. |