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Arizona is a state in the southwestern region of the United States. It is also part of the Western United States and of the Mountain West states. It is the sixth largest and the 15th most populous of the 50 states. Its capital and largest city is Phoenix. Arizona is one of the Four Corners states. It has borders with New Mexico, Utah, Nevada, California, and Mexico, and one point in common with the southwestern corner of Colorado. Arizona's border with Mexico is 389 miles (626 km) long, on the northern border of the Mexican states of Sonora and Baja California.

Arizona is the 48th state and last of the contiguous states to be admitted to the Union, achieving statehood on February 14, 1912. It was previously part of the territory of Alta California in New Spain before being passed down to independent Mexico and later ceded to the United States after the Mexican–American War. The southernmost portion of the state was acquired in 1853 through the Gadsden Purchase.

Southern Arizona is known for its desert climate, with very hot summers and mild winters. Northern Arizona features forests of pine,Douglas fir, and spruce trees; the Colorado Plateau; some mountain ranges (such as the San Francisco Mountains); as well as large, deep canyons, with much more moderate summer temperatures and significant winter snowfalls. There are ski resorts in the areas of FlagstaffAlpine, and Tucson. In addition to the Grand Canyon National Park, there are several national forestsnational parks, and national monuments. About one-quarter of the state is made up of Indian Reservations that serve as the home of a number of Native American tribes.


A map of the Grand Canyon, often considered one of the most spectacular natural attractions in the United States.

The Phoenix skyline. Phoenix is one of the ten largest cities in the United States.

A population density map of Arizona

A photo of Monument Valley in Arizona


Population Statistics

Census Counts (April 1)
20106,392,017162.07 %308,745,538
20005,130,632201.82 %281,421,906
19903,665,339241.47 %248,790,925
19802,718,215291.20 %226,545,805
2000 to 2010 % change24.6 %29.7 %
1990 to 2010 % change74.4 %224.1 %
1980 to 2010 % change135.2 %236.3 %

Components of Population Change in 2014NumberRankPercent of U.S.U.S.
Net Domestic Migration41,9753
Net International Migration14,234171.43 %995,944
Natural Increase (births minus deaths)35,120102.58 %1,363,581
Births86,868142.19 %3,957,577
Deaths51,748181.99 %2,593,996

Economy Statistics

Real Gross Domestic Product by State over Time (millions of chained 2009 dollars)Adj. Amount
RankChange Index
(YR 2009=100)
Change 2010 to 201414,851186.104

Per Capita Personal IncomeNumberRankPercent of U.S.
Per Capita Income - 2014$37,8954282.2 %
Per Capita Income - 2004 (adj. for inflation)$37,8783888.1 %
Per Capita Income - 1994 (adj. for inflation)$30,9663886.9 %
Per Capita Income - 1984 (adj. for inflation)$29,1723192.7 %
10-Year % Change0.0 %47
20-Year % Change22.4 %43
30-Year % Change29.9 %49