There's more than one place called '''Jefferson County''':

United States of America

  • Jefferson County (Alabama) - in the Metropolitan (Alabama) region of Alabama
  • Jefferson County (Arkansas)
  • Jefferson County (Colorado) - in the Front Range region of Colorado
  • Jefferson County (Florida)
  • Jefferson County (Georgia)
  • Jefferson County (Idaho)
  • Jefferson County (Illinois)
  • Jefferson County (Indiana)
  • Jefferson County (Iowa)
  • Jefferson County (Kansas)
  • Jefferson County (Kentucky)
  • Jefferson Parish (Louisiana)
  • Jefferson County (Mississippi)
  • Jefferson County (Missouri)
  • Jefferson County (Montana)
  • Jefferson County (Nebraska) - in Eastern Nebraska
  • Jefferson County (New York)
  • Jefferson County (Ohio)
  • Jefferson County (Oklahoma)
  • Jefferson County (Oregon)
  • Jefferson County (Pennsylvania)
  • Jefferson County (Tennessee)
  • Jefferson County (Texas)
  • Jefferson County (Washington) - in the Olympic Peninsula region of Washington (state)
  • Jefferson County (West Virginia)
  • Jefferson County (Wisconsin)
  • See also:

  • Jefferson Davis Parish - in Louisiana
  • Jefferson Davis County - in Mississippi