National Historic Register properties in Alton, Illinois

• Alton Chapter House
• Alton Gas & Electric Power House
• Alton Military Prison Site
• Alton National Cemetery
• Christian Hill Historic District
• Guertler House
• Haskell Playhouse
• Hotel Stratford
• Middletown Historic District
• Middletown Historic District
• Middletown Historic District (Boundary Increase)
• Middletown Historic District (Boundary Increase II)
• Mount Lookout
• Post House
• Rutherford House
• Salem Baptist Church
• Trumbull, Lyman, House
• Upper Alton Historic District
• Yakel House and Union Brewery