| The largest city in Johnson County is Iowa City, home of the University of Iowa. Johnson county contains two major interstate freeways: I-80 and I-380 which is part of the Avenue of the Saints freeway system. Johnson County is located in the fourth tier of counties north of the Iowa-Missouri border and in the third row west of the Mississippi River. It is bordered on the west by Iowa, on the north by Linn, on the east by Cedar and Muscatine and on the south by Washington and Louisa counties. |
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