Roman Catholic Diocese of Sioux City

The Cathedral of the Epiphany is a cathedral and a parish church located in Sioux City, Iowa, United States. It is the seat of the Diocese of Sioux City.

St. Thomas Episcopal Church is a parish church in the Episcopal Diocese of Iowa. The church is located in Sioux City, Iowa, United States. The church building was listed on the National Register of Historic Places in 1984.

The Sioux City Grain Exchange (SCGX) was a cash commodity market in Sioux City, Iowa that primarily traded corn, wheat, oat, and soybean. It was established in 1907 as the Sioux City Board of Trade, named the "fastest growing grain market in the world" in 1929, and among the largest exchanges in the world by the 1970s; transacting over 100 million bushels annually (valued at $1 billion as of 2018). It served the Corn Belt (primarily Iowa, Nebraska, South Dakota, and Minnesota) and primarily competed against the Chicago Mercantile Exchange, Minneapolis Grain Exchange and Kansas City Board of Trade. SCGX's rise and decline was driven by barge navigation of the Missouri River and mirrored the Sioux City Livestock Exchange (Sioux City Stockyards), the largest in the world during the 1970s. Both were co-founded by Vermont banker Fred L. Eaton.

The Woodbury County Courthouse is located at 620 Douglas Street in Sioux City, the county seat of Woodbury County, Iowa, United States. It is regarded as "one of the finest Prairie School buildings in the United States" and has been declared a National Historic Landmark for its architecture. It is used for legal proceedings in the county.

The Williges Building, also known as Cownie-Williges Building, is a historic building located in Sioux City, Iowa, United States. It is a three-story commercial block that was designed by local architects William L. Steele and George Hilgers. The structure was built for August Williges to house his fur manufacturing factory, salesroom, and storage facility. The decorative terra cotta details on the main facade are Sullivanesque in style, which reflects Steele's association with Louis Sullivan from 1897 to 1900. Completed in 1930, it is one of the last commercial buildings constructed in the early Prairie School style in the United States, and Steele's last architectural commission in Sioux City. It was also built at the end of the period of time when terra cotta was popularly used as wall cladding. The building was listed on the National Register of Historic Places in 2007.

Bishop Heelan is a private, Catholic high school in Sioux City, Iowa. It is located in the Roman Catholic Diocese of Sioux City. The school mascot is Crusaders, and their colors are navy and old gold.

The Davidson Building is a historic building located in Sioux City, Iowa, United States. It was constructed by local businessmen and real estate developers Ben and Dave Davidson. They saw the need for an upscale office building for professionals. They hired prominent local architect William L. Steele to design the Early Commercial-style structure. It was built by the leading contractor in the city, Lytle Construction Company. Completed in 1913, it was Sioux City's first office building. The exterior of the L-shaped, six-story building is composed of terra cotta panels separated by vertical bands of Roman style brick, and capped with an ornate cornice. It is Sullivanesque in its design. Commercial space is located on the first floor, and office space occupies the upper floors. The building was listed on the National Register of Historic Places in 1999. In 2016 plans were unveiled to convert the building and the adjacent Warrior Hotel into a boutique hotel and apartments. The Davidson Building houses The Warrior Apartments, as well as 56 guest rooms for The Warrior Hotel on its second, third and fourth floors.

The Lewis System Armored Car and Detective Service Building, also known as the Bell Tire and Rubber Company (Service Company) and Sioux City Tent and Awning, is a historic building located in Sioux City, Iowa, United States. F.A. Martin and Richard Nash, who owned the property, had this two-story brick commercial building constructed in 1929. KB Construction (Federation Construction Company), who built the building, occupied the second floor. Bell Tire and Rubber Company was the first business located on the first floor from 1930 to 1933. A few other businesses occupied the space until Sioux City Tent and Awning was located here from 1937 to 1941. The following year Lewis System moved in and remained until 1969. The second floor was converted into apartments about 1950. The Lewis System, Inc. was established in 1919 and incorporated in 1922 by Harry Lewis, who grew up in St. Louis and was in the United States Army before he became a railroad detective and moved to Sioux City. By 1930 the company grew to 111 employees and had offices in Sioux Falls, South Dakota, Omaha, Nebraska, Chicago, and Kansas City, Missouri. A large portion of their business was in retail crime, but they also provided security guards for business firms, security checks, and security alarms. After Harry's brother Paul joined him in the late 1930s they added the armored car division. That division opened offices in Des Moines, Waterloo, Fort Dodge, and Cedar Rapids in Iowa and in Sioux Falls. Harry Lewis served as the company president until his death in 1951, and Paul took over from him and continued until his death in 1957. The company was sold to Samartick and Company of Omaha and they operated the business here until 1969. Wells Fargo Armored Car Service took over the building in 1970 and remained here until 1996. The building was listed on the National Register of Historic Places in 2016.

The First Congregational Church, also known as Iglesia Pentecostes Evangelica Principe de Paz, is a house of worship located in Sioux City, Iowa, United States. An architectural rarity, it is one of a small group of churches in the Prairie School style of architecture. Designed primarily in the Prairie style with some eclectic touches by architect William L. Steele, its horizontal lines are emphasized by Roman brick and crisp rectilinear forms. Somewhat at variance are the distinctive dome and the prominent round heads on the windows. Fresh from his triumph with the Woodbury County Courthouse in collaboration with George Grant Elmslie, and drawing on lessons learned during that collaboration, Steele built the church in 1916–1918. This church and the courthouse are the only two Prairie style buildings that are known to have a dome. It was built for a Congregational church that had been established in Sioux City back in 1857, replacing a more traditional church that had burned down in 1916. In 1966, that congregation built a new structure on Hamilton Boulevard. First Congregational Church sold the building to Sioux City Baptist Church c. 1968. It was listed on the National Register of Historic Places in 1979 under that name. In 2009, Sioux City Baptist Church acquired a building on Viking Drive. Most recently, the building has become the Iglesia Evangelica Pentecostes Principe de Paz (Evangelical Pentecostal Church of the Prince of Peace), with services in Spanish aimed at the local Hispanic community. Due to the need for extensive building restoration and maintenance, the structure has been named to endangered building lists by at least two historic preservation groups.

The Federal Building and United States Courthouse is located in Sioux City, Iowa, United States. The present city hall in Sioux City was previously the post office, federal building and courthouse. This building replaced it. It was designed by the local architectural firm of Beuttler & Arnold with the Des Moines firm of Proudfoot, Rawson, Souers & Thomas providing input and oversight. Construction began in 1932 under the direction of the Acting Supervising Architect of the Treasury James A. Wetmore. The building was dedicated on December 29, 1933. The Federal Government had paid $270,000 for the property, and about $725,000 on construction. Architecturally, the three-story, stone structure is a combination of Stripped Classicism and Art Deco. The post office moved to a new facility in 1984, and additional office space and a new courtroom were created in the building. A further renovation was undertaken from 1999 to 2000 and a third courtroom a judge's chamber, jury deliberation room, library, and holding cell for defendants were added. The building was listed on the National Register of Historic Places in 2013.

The Sioux City Central High School and Central Annex, also known as the Castle on the Hill, are historic buildings located in Sioux City, Iowa, United States. The high school building was listed on the National Register of Historic Places in 1974. The annex was added to the historic designation in 2016.

The Warrior Hotel is a historic hotel opened in 1930 and restored in 2020, located in downtown Sioux City, Iowa, United States.