Jefferson County is a county located in the U.S. state of Kentucky. As of the 2010 census, the population was 741,096.〔(【引用サイトリンク】url=http://quickfacts.census.gov/qfd/states/21/21111.html )〕 It is the most populous county in Kentucky and is more than twice as large as the second most populous, Fayette. The county was formed in 1780 and named for future President Thomas Jefferson, who was Governor of Virginia at the time.
In 2003, its government merged with that of its largest city and county seat, Louisville, forming a new entity, the Louisville/Jefferson County Metro Government (official long form)〔(【引用サイトリンク】title=Louisville/Jefferson County Metro Government Code of Ordinances )〕 or Louisville Metro (official short form).〔(【引用サイトリンク】title=Louisville/Jefferson County Metro Government Code of Ordinances § 10.06 DEFINITIONS )〕 The new government generally avoids any self-reference including the name "Jefferson County" and has even renamed the Jefferson County Courthouse as "Metro Hall".
Jefferson County is the anchor of the Louisville-Jefferson County, KY-IN Metropolitan Statistical Area.
Jefferson County was organized in 1780 and one of the first three counties formed out of the original Kentucky County, which was still part of Virginia at the time (the other two being Fayette and Lincoln). The county is named for Thomas Jefferson, who was governor of Virginia at the time.
The last major American Indian raid in present-day Jefferson County was the Chenoweth Massacre on July 17, 1789.
Prior to the 2003 merger, the head of local government was the County Judge/Executive, a post that still exists but now has few powers. The office is currently vacant.
Local government is effectively now led by the Mayor of Louisville Metro, Greg Fischer.
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