User:Juliancolton/List of counties/I-J
- Iberia Parish, Louisiana
- Iberville Parish, Louisiana
- Ida County, Iowa
- Idaho County, Idaho
- Imperial County, California
- Independence County, Arkansas
- Indian River County, Florida
- Indiana County, Pennsylvania
- Ingham County, Michigan
- Inyo County, California
- Ionia County, Michigan
- Iosco County, Michigan
- Iowa County, Iowa
- Iowa County, Wisconsin
- Iredell County, North Carolina
- Irion County, Texas
- Iron County, Michigan
- Iron County, Missouri
- Iron County, Utah
- Iron County, Wisconsin
- Iroquois County, Illinois
- Irwin County, Georgia
- Isabella County, Michigan
- Isanti County, Minnesota
- Island County, Washington
- Isle of Wight County, Virginia
- Issaquena County, Mississippi
- Itasca County, Minnesota
- Itawamba County, Mississippi
- Izard County, Arkansas
- Jack County, Texas
- Jackson County, Alabama
- Jackson County, Arkansas
- Jackson County, Colorado
- Jackson County, Florida
- Jackson County, Georgia
- Jackson County, Illinois
- Jackson County, Indiana
- Jackson County, Iowa
- Jackson County, Kansas
- Jackson County, Kentucky
- Jackson County, Michigan
- Jackson County, Minnesota
- Jackson County, Mississippi
- Jackson County, Missouri
- Jackson County, North Carolina
- Jackson County, Ohio
- Jackson County, Oklahoma
- Jackson County, Oregon
- Jackson County, South Dakota
- Jackson County, Tennessee
- Jackson County, Texas
- Jackson County, West Virginia
- Jackson County, Wisconsin
- Jackson Parish, Louisiana
- James City County, Virginia
- Jasper County, Georgia
- Jasper County, Illinois
- Jasper County, Indiana
- Jasper County, Iowa
- Jasper County, Mississippi
- Jasper County, Missouri
- Jasper County, South Carolina
- Jasper County, Texas
- Jay County, Indiana
- Jeff Davis County, Georgia
- Jeff Davis County, Texas
- 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, Kansas
- Jefferson County, Kentucky
- Jefferson County, Mississippi
- Jefferson County, Missouri
- Jefferson County, Montana
- Jefferson County, 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
- Jefferson County, West Virginia
- Jefferson County, Wisconsin
- Jefferson Parish, Louisiana
- Jefferson Davis County, Mississippi
- Jefferson Davis Parish, Louisiana
- Jenkins County, Georgia
- Jennings County, Indiana
- Jerauld County, South Dakota
- Jerome County, Idaho
- Jersey County, Illinois
- Jessamine County, Kentucky
- Jewell County, Kansas
- Jim Hogg County, Texas
- Jim Wells County, Texas
- Jo Daviess County, Illinois
- Johnson County, Arkansas
- Johnson County, Georgia
- Johnson County, Illinois
- Johnson County, Indiana
- Johnson County, Iowa
- Johnson County, Kansas
- Johnson County, Kentucky
- Johnson County, Missouri
- Johnson County, Nebraska
- Johnson County, Tennessee
- Johnson County, Texas
- Johnson County, Wyoming
- Johnston County, North Carolina
- Johnston County, Oklahoma
- Jones County, Georgia
- Jones County, Iowa
- Jones County, Mississippi
- Jones County, North Carolina
- Jones County, South Dakota
- Jones County, Texas
- Josephine County, Oregon
- Juab County, Utah
- Judith Basin County, Montana
- Juneau County, Wisconsin
- Juneau City and Borough, Alaska
- Juniata County, Pennsylvania
