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Natrona County is a county located in the U.S. state of Wyoming. As of the 2010 census, the population was 75,450,〔(【引用サイトリンク】url=http://quickfacts.census.gov/qfd/states/56/56025.html )〕 making it the second-most populous county in Wyoming. Its county seat is Casper.〔(【引用サイトリンク】accessdate=2011-06-07 )〕 Natrona County comprises the Casper, WY Metropolitan Statistical Area. In 2010, the center of population of Wyoming was located in Natrona County, near Alcova.〔(【引用サイトリンク】url=https://www.census.gov/geo/reference/docs/cenpop2010/CenPop2010_Mean_ST.txt )〕 ==History== The first Euro-American settlement occurred in the Casper area in the late 19th century.〔(Casper Wyoming history )〕 Natrona County was created by the legislature of the Wyoming Territory on March 9, 1888, and it was later organized in 1890. The land for Natrona County was ceded from Carbon County. Natrona County was named for the deposits of natron that are found in the area. In 1909, Natrona County gained land from Fremont County. The boundaries were adjusted slightly in 1911 and 1931, and at that point the county gained its present outline. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Natrona County, Wyoming」の詳細全文を読む スポンサード リンク
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