National Historic Register properties in Mercer county/parish, Illinois

• Downtown Aledo Historic District (Aledo)
• Mercer County Courthouse (Aledo)
• Mercer County Fairgrounds (Aledo)
• Mercer County Jail (Aledo)
• Commercial House (Keithsburg)
• Keithsburg Historic District (Keithsburg)
• United Presbyterian Church (Keithsburg)
• Ives, Gideon, House (New Boston)
• Lock and Dam No. 17 Historic District (New Boston)
• Thompson, James S., House (New Boston)
• Verdurette (New Boston)
• Willits, Levi, House (New Boston)
• Sherrard Banking Company (Sherrard)