National Historic Register properties in Washington county/parish, Iowa

• St. Mary's Parish Church Buildings (Riverside)
• Rubio Bridge (Rubio)
• Baxter, H.A., Coal Company Historic District (Washington)
• Blair House (Washington)
• Brookhart, Smith Wildman and Jennie (Hearne), House (Washington)
• CM and StP Railroad Underpass (Washington)
• Conger, Jonathan Clark, House (Washington)
• Gracehill Moravian Church and Cemetery (Washington)
• Keck, Joseph, House (Washington)
• Kurtz House (Washington)
• McCleery Calendar Factory (Washington)
• Smouse, Winfield, House (Washington)
• Stewart, Frank, House (Washington)
• Washington County Courthouse (Washington)
• Washington County Hospital (Washington)
• Washington Downtown Historic District (Washington)
• West Side Residential Historic District (Washington)
• Woodlawn Cemetery Gates and Shelter (Washington)
• Young, Alexander, Cabin (Washington)
• Johnson, Thomas, Polygonal Barn (Wellman)
• Pilotburg Church (Wellman)