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Johnson County, IA
| Johnson County Population: 111,006 Population Density: 180.7 per square mile Water Area Percentage: 1.42% (8.87 square miles) Land Area Percentage: 98.58% (614.48 square miles) Total Area: 623.35 square miles Housing Units: 45,831 per square mile County Links Lakes In Johnson County • Coralville Reservoir | 
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| Quick Links Lake Carlinville News Lake Carlinville Photos Lake Carlinville Videos | 





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