| Name | Styles | Significance | Periods |
|---|
Alexander Young Cabin (W. Madison St., between G and H Aves.) | No Style Listed | architecture, social history | 1825-1849 |
Blair House (E. Washington St. and S. 2nd Ave.) | No Style Listed | architecture, politics, government, social history | 1925-1949, 1875-1899, 1900-1924 |
Frank Stewart House (603 W. Washington St.) | Queen Anne | architecture | 1875-1899, 1900-1924 |
Jonathan Clark Conger House (903 E. Washington St.) | No Style Listed | social history, education, architecture | 1900-1924, 1875-1899, 1825-1849, 1850-1874 |
Joseph Keck House (504 W. Washington St.) | Mixed (More Than 2 Styles From Different Periods) | architecture | 1850-1874 |
Kurtz House (305 S. Ave. C) | Italianate | architecture | 1850-1874 |
Smith Wildman and Jennie (Hearne) Brookhart House (1203 East Washington) | Late 19th And Early 20th Century American Movements | politics, government, architecture | 1900-1924, 1925-1949 |
Washington County Courthouse (N. B Ave.) | Art Deco, Beaux Arts, Other, Romanesque | architecture | 1925-1949, 1900-1924, 1875-1899 |
Winfield Smouse House (321 S. Iowa Ave.) | Prairie School | commerce, community planning and development | 1925-1949, 1900-1924 |