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Silver Spring is an unincorporated area and census-designated place (CDP) in Montgomery County, Maryland, United States. It had a population of 76,716 according to 2013 estimates by the United States Census Bureau, making it the fourth most populous place in Maryland, after Baltimore, Columbia, and Germantown.〔(【引用サイトリンク】 title=Geographic Comparison Table, 2010 Census Redistricting Data Summary File, Maryland: By Place )〕 The urbanized, oldest, and southernmost part of Silver Spring is a major business hub that lies at the north apex of Washington, D.C. As of 2004, the Central Business District (CBD) held of office space, 5216 dwelling units and of parkland. The population density of this CBD area of Silver Spring was 15,600 per square mile all within and approximately in the CBD/downtown area. The community has recently undergone a significant renaissance, with the addition of major retail, residential, and office developments. Silver Spring takes its name from a mica-flecked spring discovered there in 1840 by Francis Preston Blair, who subsequently bought much of the surrounding land. Acorn Park, tucked away in an area of south Silver Spring away from the main downtown area, is believed to be the site of the original spring. ==Geography== As an unincorporated area, Silver Spring's boundaries are not officially defined. As of the 2010 Census the United States Census Bureau defines Silver Spring as a census-designated place with a total area of , all land; however, it does contain numerous creeks and small lakes. This definition is a 15% reduction from the 9.4 sq. mi. used in previous years. The United States Geological Survey locates the center of Silver Spring at , notably some distance from the Census Bureau's datum. By another definition, Silver Spring is located at (39.004242, -77.019004). The definitions used by the Silver Spring Urban Planning District, the United States Postal Service, the Greater Silver Spring Chamber of Commerce, etc., are all different, each defining it for its own purposes. Residents of a large swath of South-Eastern Montgomery County have Silver Spring mailing addresses. This area extends roughly from the Washington, D.C., Prince George's County, Maryland and Howard County, Maryland lines to the south, east and north, and Rock Creek Park and Plyers Mill Road to the west and north-west. These boundaries make Silver Spring larger in area than any city in Maryland except for Baltimore. Some notable landmarks are the world headquarters of Discovery Communications, the AFI Silver Theatre, the NOAA headquarters, the headquarters of the Seventh-day Adventist Church and the national headquarters of the Ahmadiyya Muslim Community. 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「Silver Spring, Maryland」の詳細全文を読む スポンサード リンク
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