page_title: Jefferson County, Kentucky
hierarchical_section_title: Jefferson County, Kentucky
caption_attribution_description: English: Image of the Jefferson County Courthouse in en:Louisville, Kentucky, which is on the en:National Register of Historic Places.
context_page_description: Jefferson County is a county located in the U.S. state of Kentucky. As of the 2010 census, the population was 741,096. It is the most populous county in the commonwealth. Its county seat and largest city is Louisville, Kentucky.
context_section_description: Jefferson County is a county located in the U.S. state of Kentucky. As of the 2010 census, the population was 741,096. It is the most populous county in the commonwealth. Its county seat and largest city is Louisville, Kentucky.
caption: Jefferson County Courthouse (now Louisville Metro Hall) in downtown Louisville
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