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| 9950613704 | Central Place theory | A theory that explains the distribution of services, based on the fact that settlements serve as centers of market areas for services; larger settlements are fewer and farther apart than smaller settlements and provide services for a larger number of people who are willing to travel farther. | 0 | |
| 9950621043 | Gravity model | A model that holds that the potential use of a service at a particular location is directly related to the number of people in a location and inversely related to the distance people must travel to reach the service. | 1 | |
| 9950630156 | Urbanization | An increase in the percentage of the number of people living in urban settlements | 2 | |
| 9950638255 | Multiple Nuclei Model | A model of the internal structure of cities in which social groups are arranged around a collection of nodes of activities. | 3 | |
| 9950799570 | Sector Model | A model of the internal structure of cities in which social groups are arranged around a series of sectors, or wedges, radiating out from the central business district. | 4 | |
| 9950808021 | Sprawl | Development of new housing sites at relatively low density and at locations that are not contiguous to the existing built-up area. | 5 | |
| 9950816528 | Urban Cluster | In the United States, an urban area with between 2,500 and 50,000 inhabitants. | 6 | |
| 9950828767 | Urbanized Area | In the United States, an urban area with at least 50,000 inhabitants. | 7 | |
| 9950837426 | Urban Area | A dense core of census tracts, densely settled suburbs, and low-density land that links the dense suburbs with the core. | 8 | |
| 9951955648 | Concentric Zone Model | A model of the internal structure of cities in which social groups are spatially arranged in a series of rings. | 9 | |
| 9952154086 | Primate city | The largest settlement in a country, if it has more than twice as many people as the second-ranking settlement. | 10 | |
| 9952159079 | Gentrification | A process of converting an urban neighborhood from a predominantly low-income, renter-occupied area to a predominantly middle-class, owner-occupied area. | 11 |
