Humboldt is a city in Gibson and Madison counties, Tennessee. Humboldt is a city in Humboldt County, Iowa. Humboldt is a city in Allen County, Kansas. Humboldt Township is a township in Marquette County, Michigan. Humboldt is a city in Kittson County, Minnesota. Humboldt is a city in Richardson County, Nebraska. Humboldt is a town in Minnehaha County, South Dakota. Humboldt is a town in Brown County, Wisconsin. Humboldt is a village in Coles County, Illinois. Humboldt County is a county in California and Nevada.