Rock Island County, IL
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            Rock Island County Population: 149,374 Population Density: 350.0 per square mile Water Area Percentage: 5.41% (24.40 square miles) Land Area Percentage: 94.59% (426.75 square miles) Total Area: 451.16 square miles Housing Units: 64,489 per square mile County Links Lakes In Rock Island County • Lake George  | 
        
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