Population density per square kilometre by country, 2006

Population density map of the world in 1994.

Population density is a measurement of population per unit area or unit volume. It is frequently applied to living organisms, humans in particular. Image File history File links Download high resolution version (1368x681, 53 KB) Summary Countries of the world by population density, based on 30 March 2006 version of wikipedia:List of countries by population density. ... Image File history File links Download high resolution version (1368x681, 53 KB) Summary Countries of the world by population density, based on 30 March 2006 version of wikipedia:List of countries by population density. ... “km” redirects here. ... Year 2006 (MMVI) was a common year starting on Sunday of the Gregorian calendar. ... Image File history File links Download high-resolution version (4320x2160, 914 KB) This image shows the number of people per square kilometer around the world in 1994. ... Image File history File links Download high-resolution version (4320x2160, 914 KB) This image shows the number of people per square kilometer around the world in 1994. ... In biology and ecology, an organism (in Greek organon = instrument) is a living being. ... This article is about modern humans. ...

Biological population densities

Population density is a common biological measurement and is often used by conservationists and measure than population size. Biological data is data or measurements collected from biological sources, which is stored or exchanged in a digital form. ... Conservationists are those people who tend to more highly rank the wise use of the Earths resources and ecosystems. ...

Low densities may cause an extinction vortex and lead to further reduced fertility. This is called the Allee effect, after W. C. Allee who first identified it. Examples of the causes in low population densities include: Extinction Vortices are a means through which conservation biologists, geneticists and ecologists can understand the dynamics of and categorize extinctions in the context of their causes. ... The Allee effect is a phenomenon in biology named after W. C. Allee, who first wrote extensively on it. ... Warder Clyde Allee (June 5, 1885 - March 18, 1955) was an American zoologist and ecologist who taught animal ecology at the University of Chicago. ...

• Increased problems with locating mates
• Increased inbreeding

Different species have different expected densities. R-selected species commonly have high population densities, while K-selected species may have lower densities. Low densities may be associated with specialised mate location adaptations such as specialised pollinators; as found in the orchid family (Orchidaceae). It has been suggested that inbreeding depression be merged into this article or section. ... In ecology, r-selection (note: lower case r) relates to the selection of traits (in organisms) that allow success in unstable or unpredictable environments. ... In ecology, K-selection (note : upper case K) relates to the selection of traits (in organisms) that allow success in stable or predictable environments. ... Orchid re-directs here; for alternate uses see Orchid (disambiguation) Genera Over 800 See List of Orchidaceae genera. ...

The formula to calculate density is:

Human population density

Main article: list of countries by population density

A street in Hong Kong, one of the most densely-populated places in the world.

A street in Ulan Bator, Mongolia - the least densely-populated country in the world.

For humans, population density is the number of persons per unit of area (which may include or exclude cultivated or potentially productive area). Commonly this may be calculated for a county, city, country, another territory, or the entire world. Population density by country, 2006 List of countries and dependencies by population density in inhabitants/km². The list includes sovereign states and self-governing dependent territories that are recognized by the United Nations. ... Image File history File linksMetadata Download high resolution version (3008x2000, 769 KB) Summary A crowd in Soy Street in Mong Kok, Hong Kong. ... Image File history File linksMetadata Download high resolution version (3008x2000, 769 KB) Summary A crowd in Soy Street in Mong Kok, Hong Kong. ... Image File history File linksMetadata Download high resolution version (1024x768, 253 KB)Albert Hazan File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Image File history File linksMetadata Download high resolution version (1024x768, 253 KB)Albert Hazan File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Coordinates: , Established as Örgöö 1639 current location 1778 Ulaanbaatar 1924 Area  - City 4,704. ... Human beings are defined variously in biological, spiritual, and cultural terms, or in combinations thereof. ... A county is generally a sub-unit of regional self-government within a sovereign jurisdiction. ... Look up city, City in Wiktionary, the free dictionary. ... For other uses, see Country (disambiguation). ... Types of administrative and/or political territories include: A legally administered territory, which is a non-sovereign geographic area that has come under the authority of another government. ... This article is about Earth as a planet. ...

The world population is 6.6 billion humans, and Earth's area is 510 million square kilometers (200 million square miles). Therefore the world-wide human population density is 6.5 billion / 510 million = 13 per km² (33 per sq mi), or 43 per km² (112 per sq mi) considering that humans live on land, which forms 150 million km² (58 million sq mi) of the earth. This density rises with the population growth. Map of countries by population — China and India, the only two countries to have a population greater than one billion, together possess more than a third of the worlds population. ... This article is about Earth as a planet. ...

Several of the highest-density territories in the world are very large city-states, micronations or dependencies. These territories share a relatively small area and an exceptionally high urbanization level, with an economically specialized city population drawing also on rural resources outside the area, illustrating the difference between high population density and overpopulation. A city-state is a region controlled exclusively by a city. ... This article is about small nations that are not recognized by any world government. ... A dependent territory, dependent area or dependency is a territory that does not possess full political independence or sovereignty as a State. ... Look up city, City in Wiktionary, the free dictionary. ... Map of countries by population density (See List of countries by population density. ...

Cities with exceptionally high population densities are often considered to be overpopulated, though the extent to which this is the case depends on factors like quality of housing and infrastructure or access to resources. Most of the largest densely-populated cities are in southern and eastern Asia, though Cairo and Lagos in Africa also fall into the category. City population is however, heavily dependent on the definition used for the urban area: densities will be far higher for the central municipality than when more recently-developed and as yet administratively unincorporated suburbs are included, as in the concepts of agglomeration or metropolitan area, the latter including sometimes neighbouring cities. For other uses, see Asia (disambiguation). ... Nickname: Egypt: Site of Cairo (top center) Coordinates: , Government  - Governor Dr. Abdul Azim Wazir Area  - City 214 km²  (82. ... For other uses, see Lagos (disambiguation). ... A world map showing the continent of Africa Africa is the worlds second-largest and second most-populous continent, after Asia. ... In the study of human settlements, an agglomeration is an extended city or town area comprising the built-up area of a central place (usually a municipality) and any suburbs or adjacent satellite towns. ... This article does not cite any references or sources. ...

Other methods of measurement

While the arithmetic density is the most common way of measuring population density, several other methods have been developed which aim to provide a more accurate measure of population density over a specific area.

• Arithmetic density: The total number of people / area of land measured in km² or mi².

• Physiological density: The total population / the amount of arable land.

• Agricultural density: The total rural population / amount of agricultural land.

• Residential density : The number of people living in an urban area / the area of residential land.

• Urban density : The number of people inhabiting an urban area / the total area of urban land

• Ecological optimum: The density of population which can be supported by the area's natural resources.

Urban density is a term used in urban planning and urban design to refer to the number of people inhabiting a given urbanized area. ...

See also

• List of countries by population density
• List of countries by population
• List of religious populations
• List of selected cities by population density
• List of U.S. states by population density
• Human geography
• Idealised population
• Optimum population
• Population bottleneck
• Population coding
• Population genetics
• Population health
• Population momentum
• Population pyramid
• Small population size
• Cars
• Trucks

Population density by country, 2006 List of countries and dependencies by population density in inhabitants/km². The list includes sovereign states and self-governing dependent territories that are recognized by the United Nations. ... This is a list of countries ordered according to population. ... Christianity - Percentage by country Islam - Percentage by country Buddhism - Percentage by country Hinduism - Percentage by country The table above is compiled from the relevant Wikipedia pages listing Religions by Country. ... This is a list of selected cities and their corresponding population densities. ... Map of states showing population density This is a list of the 50 U.S. states, ordered by population density. ... Population density by country, 2006 Human geography is a branch of geography that focuses on the study of patterns and processes that shape human interaction with the environment, with particular reference to the causes and consequences of the spatial distribution of human activity on the Earths surface. ... In population genetics an idealised population or a Fisher — Wright population is a population whose members can mate and reproduce with any other member of the other gender, and where random genetic drift does not occur. ... Optimum population is where the amount of resources available in a country is equal to the countrys population needs, so there are enough resources to maintain its population. ... A population bottleneck (or genetic bottleneck) is an evolutionary event in which a significant percentage of a population or species is killed or otherwise prevented from reproducing, and the population is reduced by 50% or more, often by several orders of magnitude. ... Population encoding is a means by which information about something is encoded in the brain. ... Population genetics is the study of the distribution of and change in allele frequencies under the influence of the four evolutionary forces: natural selection, genetic drift, mutation, and migration. ... Population health is an approach to health that aims to improve the health of the entire population and to reduce health inequities among population groups. ... Population momentum is an effect which causes population growth. ... This distribution is named for the pyramidal shape of its graph. ... Species with a small population size are subject to a higher chance of extinction because their small population size makes them more vulnerable to genetic drift, resulting in stochastic variation in their gene pool, their demography and their environment. ... Cars can refer to: Cars (film), a Disney/Pixar movie released in 2006 Cars (video game), a cross platform video game based on the 2006 film Cars (song), a hit song by Gary Numan CARS, the acronym The Cars, an American new wave band. ... Trucks can refer to several things: The plural of: Truck, the motorized vehicle Truck, other uses of the singular As a name: Trucks was a rock band Trucks is a short story by Stephen King Trucks is a movie based on the Stephen King short story Trucks! is a television...

External links

• City Ranks combines Google Maps and 2000 Census data to show the population densities of U.S. zip codes on an interactive map.
• Selected Current and Historic City, Ward & Neighborhood Densities
• Population density world-map