Lewis System Armored Car and Detective Service Building

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

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 Motor Mart Building, also known as the Commerce Building, is a historic building located in Sioux City, Iowa, United States. It was built by Ralph A. Bennett, who was the owner of Bennett Auto Supply Company. The structure was designed in the style of the Chicago school by E.J. Henriques of the C.F. Lytle Company of Sioux City, who also built the structure. It was initially designed to be two stories tall, but the plans were changed and two more floors were added. It was designed to display, repair and provide parking for automobiles. It was also the first building in Sioux City to incorporate the flat slab system of framing of Claude A.P. Turner, and it was one of the first reinforced, poured concrete buildings in the city. The exterior of the concrete frame structure is clad with glazed brick over common brick infill. The building features terra cotta decorative elements. A.L. Galinsky bought the building in 1919 and converted it into an office building. Its name was changed to the Commerce Building at that time. The Roof Garden was added above the fourth floor from 1921 to 1923. It is a gabled structure covered with stucco. Large Palladian windows line the side walls. The structure housed a ballroom that hosted a variety of social events, and where many big bands played. Lawrence Welk played an early concert here. The building was listed on the National Register of Historic Places in 1993.

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 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.

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.

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 

The Orpheum Theatre, also known as New Orpheum Theatre and Orpheum Electric Building, is a performing arts center located at 528 S. Pierce Street in Sioux City, Iowa. Built in 1927 as a vaudeville and movie palace, the theatre was restored in 1999 and today is the home of the Sioux City Symphony Orchestra.

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 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.

The Martin Hotel, erected as a Chicago style building in 1912, is located in Sioux City, Iowa. Added to the National Register of Historic Places in 1983, it is significant for its architecture, operating for many years as the Sheraton-Martin Hotel and now known as the Martin Tower Apartments.

Sioux City Community School District (SCCSD) is a public school district headquartered in the Educational Service Center in Sioux City, Iowa. The district is mostly in Woodbury County, with a portion in Plymouth County.