National Historic Register properties in Warren county/parish, Illinois
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Alexis Opera House (Alexis)
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Brewer, May (Carns) and John E., House (Monmouth)
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Carr House (Monmouth)
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Colwell, E. B., and Company Department Store (Monmouth)
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Martin, Sarah, House (Monmouth)
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Monmouth Courthouse Commercial Historic District (Monmouth)
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Patton Block Building (Monmouth)
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Pike-Sheldon House (Monmouth)
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Quinby, Ivory, House (Monmouth)
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Stewart, Minnie, House (Monmouth)
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Weir, William S., Jr., House (Monmouth)