Largest Iowa
counties by population
Polk County ranks number 1 in the state with a population of 429,439.
Linn County ranks number 2 in the state with a population of 209,226.
Scott County ranks number 3 in the state with a population of 166,650.
Johnson County ranks number 4 in the state with a population of 131,005.
Black Hawk County ranks number 5 in the state with a population of 129,276.
Woodbury County ranks number 6 in the state with a population of 102,831.
Dubuque County ranks number 7 in the state with a population of 93,072.
Pottawattamie County ranks number 8 in the state with a population of 90,224.
Story County ranks number 9 in the state with a population of 87,214.
Dallas County ranks number 10 in the state with a population of 61,950.
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