| Name | Styles | Significance | Periods |
|---|
Alfred Hebard House (700 8th St.) | Italianate | architecture | 1850-1874 |
B. F. Runnels House (SW of Red Oak) | Second Empire | architecture | 1875-1899 |
Edmund B. Osborne House (1020 Boundary St.) | Classical Revival, Late 19th And 20th Century Revivals | invention, industry, architecture | 1875-1899 |
Montgomery County Courthouse (Coolbaugh and 2nd Sts.) | Romanesque | architecture | 1875-1899 |
Montgomery County Jail (100 W. Coolbaugh St.) | Queen Anne, Colonial Revival | law, architecture | 1925-1949, 1900-1924, 1875-1899 |
Red Oak Firehouse and City Jail (318 E. Washington Ave.) | Late Victorian | politics, government | 1875-1899, 1900-1924, 1950-1974, 1925-1949 |
Red Oak Public Library (2nd and Washington Sts.) | Tudor Revival | architecture | 1900-1924 |