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Capital District of Columbia : |
Washington, DC .
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| Climate District of Columbia :
| mostly temperate, but tropical in Hawaii and Florida, arctic in Alaska, semiarid in the great plains west of the Mississippi River, and arid in the Great Basin of the southwest; low winter temperatures in the northwest are ameliorated occasionally in January and February by warm chinook winds from the eastern slopes of the Rocky Mountains .
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| Life expectancy District of Columbia :
| 77.43 years .
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| Fertility rate District of Columbia :
| 2.07 children born/woman (2004 est.) .
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| Government District of Columbia :
| Constitution-based federal republic; strong democratic tradition .
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| Population United States :
| 293,027,571 (July 2004 est.) .
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| Area Total United States :
| 9,631,418 sq km .
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| Telephones Main Lines In Use United States :
| 181,599,900 (2003) .
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| Telephones Mobile Cellular United States :
| 158.722 million (2003) .
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| International Country Code District of Columbia :
| 1.
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