U.S. Post Office – Caldwell Main

The Caldwell Historic District in Caldwell, Idaho, is an area of approximately four acres in downtown Caldwell along Main Street, South 7th Avenue, South Kimball Avenue, and Arthur Street. Fires in 1884 and in 1896 destroyed businesses in early Caldwell, and brick had become Caldwell's favored building material for downtown structures.: 50  In 1906 alone, brick construction on Main Street between South 7th and South Kimball Avenues included the Steunenberg Block, the Egleston Block, and expansion of the Lucas Block—soon known as the Little Block and later dubbed the Harmon Building. When the Caldwell Historic District was surveyed in 1982, many brick historic buildings adjacent to the district were not included.The district includes Romanesque Revival and modest commercial architecture, although some facades have been altered since construction. The 1982 site survey noted 14 buildings, and the district was added to the National Register of Historic Places (NRHP) July 19, 1982.

The North Caldwell Historic District in Caldwell, Idaho, includes one church and five houses constructed in the Queen Anne style in the 1880s and 1890s. The historic district is between Albany and Belmont Streets on 9th Avenue with one house midblock on Belmont between 8th and 9th Avenues. The district was listed on the National Register of Historic Places in 1979, and it is part of a larger, 15-site walking tour also designated by the city of Caldwell as North Caldwell Historic District.

Amano is a Mexican restaurant in Caldwell, Idaho. Established in September 2019, the business was included in The New York Times's 2023 list of the 50 best restaurants in the United States.

The Caldwell Carnegie Library in Caldwell, Idaho, also known as the Caldwell Veterans Memorial Hall, was constructed from a grant by the Carnegie library foundation. The building opened in 1914 and was added to the National Register of Historic Places June 18, 1979. Its modest, 1-story Renaissance design is credited to Charles Carroll Soule and features reading rooms on either side of the main entrance. The building also includes a full basement with lecture hall.

The Thomas K. Little House is a 1+1⁄2-story Queen Anne style house built for the Littles by Robert E. Miller in 1896 in Caldwell, Idaho. Added to the National Register of Historic Places in 1980, the house features an irregular pattern with small rooms constructed around two parlors, and it sits on a lava rock foundation.Thomas K. Little was a dry goods merchant in Caldwell, and he was elected mayor of Caldwell in 1904. With the help of architect Thomas H. Soule in 1906, he remodeled the Little Block (Harmon Building) at the corner of Kimball and Main Streets, expanding the building and adding its decorative corner turret. After his retirement in 1910, Little moved from Caldwell to Boise.

The A.K. Steunenberg House in Caldwell, Idaho, is a 2-story Colonial Revival expansion by Tourtellotte & Co. in 1904 of a smaller Queen Anne house. The 1904 renovation established a 2-story, round corner tower and a colonnade with three prominent columns marking the Kimball Street exposure. The original house at the northwest corner of North 4th and Kimball Streets may have been occupied by the Steunenbergs as early as 1890.

St. Mary's Catholic Church is a red brick, Italianate Romanesque Revival building designed by Tourtellotte and Hummel and constructed by H.J. McNeel in 1925 in Caldwell, Idaho. The church features an 80-ft tower, and the building was added to the National Register of Historic Places in 1982.Originally intended as the Church of the Immaculate Conception, the building was known as St. Mary's Catholic Church by 1930 or earlier.The church was designed to seat a congregation of 300 persons, and it remained in service as a Catholic building until 2003, when larger Our Lady of the Valley Catholic Church opened in Caldwell.

Canyon Springs High School is a high school in Caldwell, Idaho. It is operated by the Caldwell School District.

The John C. Rice House is a 2-story, Queen Anne style house constructed in 1896 in the Washington Heights neighborhood, afterwards relocated to 2121 College Ave> of Caldwell, Idaho. The house features an octagonal turret at the south end of a wraparound porch, a gable roof, and (originally) a lava rock foundation. In 1904 a cement sidewalk was constructed from the Rice House to downtown Caldwell, a distance of approximately 16 blocks. The house was listed on the National Register of Historic Places (NRHP) May 27, 1980, and would have been part of the Steunenberg Residential Historic District, established in 2002, but it was relocated and substantially altered sometime after its listing on the NRHP.

Caldwell (locally CALL-dwel) is a city in and the county seat of Canyon County, Idaho. The population was 59,996 at the time of the 2020 United States census, making it the 5th most populous city in Idaho.Caldwell is considered part of the Boise metropolitan area. Caldwell is the location of the College of Idaho.

The Caldwell Odd Fellow Home for the Aged in Caldwell, Idaho was built in 1920. It was designed by Tourtellotte & Hummel and built by C. E. Silbaugh with aspects of Late 19th and 20th Century Revivals architecture and Second Renaissance Revival architecture. It was listed on the National Register of Historic Places in 1982.It is a two-story stucco U-shaped building that is about 140 feet (43 m) wide and 45 feet (14 m) deep.It was studied in a 1982 study of Tourtellotte and Hummel architecture. The home no longer belongs to the Odd Fellows.

The Henry W. and Ida Frost Dorman House is a 2-story, Neoclassical house in Caldwell, Idaho, designed and constructed in 1910 by local builder Lem Harding. The Dormans occupied the house from 1910 until 1919, when it was purchased by three doctors and refitted as a private hospital, the Caldwell Sanitarium. When the sanitarium closed in 1949, the house was donated to the P.E.O. Sisterhood for renovation as a "chapter house" or retirement home for members.