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is a city in Jefferson County, Kentucky, United States. The population was 26,633 at the 2000 census. As of 2005, the population is estimated to be 26,100, making Jeffersontown the eleventh largest city in Kentucky. When the Louisville and Jefferson County governments merged in 2003, Jeffersontown (commonly called "J-Town" by those familiar with the area) did not join the consolidated government, resulting in some discrepancy between the official Census Bureau statistics for Louisville-Jefferson County and those compiled by the Metro government, as the Census Bureau does not include the incorporated cities within Jefferson County in the population for Louisville Metro.
Jeffersontown was founded in the late 18th century by Abraham Bruner as "Brunerstown". The city was chartered as Jeffersontown in 1797, after then Vice-President Thomas Jefferson.