Mercer County, IL
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            Mercer County Population: 16,957 Population Density: 30.2 per square mile Water Area Percentage: 1.38% (7.86 square miles) Land Area Percentage: 98.62% (561.02 square miles) Total Area: 568.88 square miles Housing Units: 7,109 per square mile County Links Waterfalls In Mercer County • Boston Bay • Sturgeon Bay Lakes In Mercer County • Fyre Lake  | 
        
            
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