St. Thomas Orthodox Church (Sioux City, Iowa)

The Sioux City metropolitan statistical area, as defined by the United States Census Bureau, is an area consisting of four counties in three states – Iowa, Nebraska, and South Dakota, anchored by the city of Sioux City, Iowa. As of the 2020 census, the MSA had a population of 145,940. Plymouth County, Iowa, was removed from the definition of the MSA prior to the 2020 census.

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 Sioux City Masonic Temple in Sioux City, Iowa was built during 1921–1922. It was listed on the National Register of Historic Places in 2004. It is a two and a half or three story building that cost nearly $300,000 to build, not including nearly $200,000 of custom furnishings. In 2004 it was deemed significant as "an excellent, unaltered example of the Spanish Colonial Revival architectural design"; it was one of only two downtown commercial buildings in that style, which was popular during 1915 to 1940. The other is the NRHP-listed Sioux City Free Public Library, two blocks south. It was designed by Sioux City architects Beuttler and Arnold.: 8 

Ye Olde Tavern was a restaurant that specialized in tavern sandwiches located at the corner of 14th and Jackson streets in Sioux City, Iowa. The establishment was founded by John David ("Dave") Heglin, who is credited as one of the creators of the tavern sandwich.

The Alhambra Apartments is a historic building located in Sioux City, Iowa, United States. The city experienced a building boom in 1929, and this building was constructed at that time by American Builders Incorporated of Lincoln, Nebraska. It was one of five apartment buildings built in the city that year, and based on the cost of construction it was the largest. The six-story U-shaped building rests on top of an underground parking garage. The residents could access the garage by way of an elevator. The building is composed of reinforced concrete faced with tan brick and terra cotta trim. Its design is an eclectic mix of architectural styles with Moorish influences. The Alhambra is located in a residential called the Near North-Side, just outside of the central business district. It was listed on the National Register of Historic Places in 2001.

Mount Sinai Temple is an historic former Reform synagogue located in Sioux City, Iowa, in the United States. The building was listed on the National Register of Historic Places in 1999.

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 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.

Mary Elizabeth Day Nursery, also known as Mary Elizabeth Day Care Center, is a historic building located in Sioux City, Iowa, United States. This is the oldest child day care facility in the state of Iowa, and the state's second-oldest preschool. The Sioux City Day Nursery was established in 1914 by the Wall Street Mission, a local settlement house operated by the Methodist Episcopal Church. They moved here in 1926, which is the first building designed as a day nursery in Iowa. The two-story brick Renaissance Revival building was designed by local architect Jurgen A. Raven, and built by The Lytle Company, a Sioux City construction firm. Parents were responsible for paying for at least part of their children's care, but it was also subsidized by religious institutions, private associations, and individuals. During the Great Depression, both the federal and state governments began to fund and license child care. The Works Progress Administration was involved in the 1930s. A garage and playhouse designed by Sioux City architect Knute E. Westerlind was built in 1940, and it is part of the historic designation. The facility was renamed the Mary Elizabeth Day Care Center in 1990. The building was listed on the National Register of Historic Places in 1997.

The Sioux City Free Public Library is a historic building located in Sioux City, Iowa, United States. The library was located in a section of the Municipal Building, no longer extant, between 1892 and 1913. It had outgrown the space when the Library Board contacted Andrew Carnegie in 1910 about providing the funding for a new library building. Their request was initially turned down. They chose to work with New York City architect Edward L. Tilton, an architect preferred by Carnegie, in place of local architect William L. Steele who was working with the board previously. Local resident George Murphy donated the property for the new building. Meanwhile, Tilton designed the two-story brick Renaissance Revival building. On April 8, 1911, Carnegie approved the project and donated $75,000 for the building's construction. The new building was dedicated on March 6, 1913, and it is considered "an excellent early twentieth century example of the architectural development of library planning and design." It was Tilton's only building in Iowa. Plans were made to enlarge the building in 1938, but the bond issue failed. The library remained in its cramped quarters until 1989 when it moved into a former bank building downtown. Ownership of the Carnegie building was transferred to a group of investors in 1996 who transformed it into apartments. It was listed on the National Register of Historic Places the following year.

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.