List of all counties in ABC order, that begin on letter I. Counties with red border around name have population of more than 100 000. Double width border represents the population of 500 000+.
Iberia Parish, LA Iberville Parish, LA Ida County, IA Idaho County, ID Imperial County, CA Independence County, AR Indian River County, FL Indiana County, PA Ingham County, MI Inyo County, CA Ionia County, MI Iosco County, MI Iowa County, IA Iowa County, WI Iredell County, NC Irion County, TX Iron County, MI Iron County, MO Iron County, UT Iron County, WI Iroquois County, IL Irwin County, GA Isabella County, MI Isanti County, MN Island County, WA Isle of Wight County, VA Issaquena County, MS Itasca County, MN Itawamba County, MS Izard County, AR
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