Jefferson County

Jefferson County is the name of 26 counties in the United States of America. The following are named for Thomas Jefferson, third President of the United States of America:

• Jefferson County, Alabama
• Jefferson County, Arkansas
• Jefferson County, Colorado
• Jefferson County, Florida
• Jefferson County, Georgia
• Jefferson County, Idaho
• Jefferson County, Illinois
• Jefferson County, Indiana
• Jefferson County, Iowa
• Jefferson County, Kentucky
• Jefferson County, Missouri
• Jefferson County, Nebraska
• Jefferson County, New York
• Jefferson County, Ohio
• Jefferson County, Oklahoma
• Jefferson County, Pennsylvania
• Jefferson County, Tennessee
• Jefferson County, West Virginia
• Jefferson County, Wisconsin

It is not certain whether the following were named for Thomas Jefferson:

• Jefferson County, Kansas
• Jefferson Parish, Louisiana
• Jefferson County, Mississippi
• Jefferson County, Montana
• Jefferson County, Washington

Specifically named for other sources:

• Jefferson County, Oregon (named for Mount Jefferson[?] on its western border; therefore indirectly named for Thomas Jefferson, as the mountain was named for the President.)
• Jefferson County, Texas (named for Jefferson, Texas, the municipality that preceded the county; therefore indirectly named for Thomas Jefferson, as the municipality was named for the President.)

There is also a Jefferson Davis Parish, Louisiana and a Jefferson Davis County, Mississippi