Downtown Quincy Historic District

State Savings Loan and Trust is a historic bank building located at 428 Maine Street in Quincy, Illinois. The bank was built in 1892 for brothers Lorenzo and Charles H. Bull, who were prominent Quincy businessmen and community leaders. Chicago architectural firm Patton & Fisher designed the bank in the Richardsonian Romanesque style; local architect Ernest M. Wood designed an addition for the building in 1906. The building has a five-bay facade, with three bays on the original portion and two on the addition; the bays are each marked by a window with a thick stone arch. The original section is topped by a large front-facing gable, providing for attic space above the second story.The building was added to the National Register of Historic Places on March 23, 1979.

The Morgan-Wells House, also known as the Norwood-Morgan-Wells House, was added to the United States National Register of Historic Places on November 16, 1977. The house was located at 421 Jersey Street in the Adams County city of Quincy, Illinois. This Italianate structure was built in 1860 onto another structure by Edward Wells. The original building, which was later the rear of the house, was constructed in 1853 by J.E. Norwood, a pork packer. Quincy banker Lorenzo Bull, who owned the home by 1901, gave it to the Cheerful Home Association and it became the first licensed children's home in the state of Illinois in 1901. In 1933 the YWCA purchased the home for $10.On October 17, 2016, the Quincy City Council approved a demolition permit for the Morgan-Wells House to allow the expansion of offices for the local newspaper. The Herald-Whig subsequently took title to the house and promptly demolished it.

The Adams County Courthouse is a government building in central Quincy, the county seat of Adams County, Illinois, United States. Built in 1950 after a tornado destroyed its predecessor, it is the fourth building to serve as a courthouse for Adams County.

The S.J. Lesem Building is a historic commercial building located at 135-37 North 3rd Street in Quincy, Illinois. The building was constructed in 1871 for S.J. Lesem Brothers and Company, a dry goods firm founded in 1859; it is the only survivor of the four commercial buildings which once occupied the block, which was known as Wholesale Row. After the dry goods company changed ownership and moved elsewhere, the Quincy Casket Company occupied the building from 1912 to 1977. The four-story building has a commercial Italianate design. The building's windows are tall and narrow with arched or pedimented hoods, and its storefront features brick pilasters and cast iron columns. Cast iron quoins adorn the corners of the building. The top of the building features a bracketed cornice and a pediment on the front facade.The building was added to the National Register of Historic Places on November 22, 1999.

The Oakley-Lindsay Center is the regional convention center for Quincy, Illinois and the tri-state region. It opened in 1995 at a cost of $8 million. It serves as the convention hub of the Quincy micropolitan area and fills the market in-between St. Louis and Iowa City. The center served as a sandbagging focal point during the Flood of 2008 with over 1 million sandbags filled. The Oakley-Lindsay Center and the sandbagging effort was featured on many news organizations and even had a visit from then-presidential candidate Barack Obama (D-IL) on Saturday, June 14.

The Robert W. Gardner House in Quincy, Illinois, Adams County, is designed in the Second Empire style (along with a few elements common to Italianate style) and found its place among the locales on the National Register of Historic Places on April 20, 1979. Though the building was constructed in the later half of the 19th century, 1873, the architect as well as the builder are unknown. The interior woodwork, all original, has been fully restored including the walnut staircase. Gardner invented the speed governor used in steam engines and the Gardner Museum of Architecture and Design in Quincy is named for him.

St. John's Anglican Cathedral is the designated cathedral and mother church of the Anglican Diocese of Quincy, located at 701 Hampshire Avenue in Quincy, Illinois. Established in 1837 as the first Anglican/Episcopal church in Quincy, its current building dates to 1853 and is a contributing property to the Downtown Quincy Historic District. The building is the oldest existing church in Quincy.

The Ernest M. Wood Office and Studio is a building located in the Adams County, Illinois city of Quincy. The building was designed by Quincy architect Ernest M. Wood and reflects the designs of Frank Lloyd Wright; as such it is an example of Prairie style architecture. The building, stucco and wood, was completed in 1912 and listed on the National Register of Historic Places on August 12, 1982. The Office and Studio incorporates typical elements of Prairie style such as geometric shapes and horizontals. A restoration during the 1980s helped to repair such features as skylights, stained glass windows and built-in bookcases.

The One Thirty North Eighth Building is a historic building located at 130 North 8th Street in Quincy, Illinois.

The U.S. Post Office and Courthouse is a post office and federal courthouse located at 200 North Eighth Street in Quincy, Illinois. The building was designed in 1885 and completed in 1887. Architect Mifflin E. Bell, Supervising Architect at the time, designed the French Renaissance Revival style building. Bell's design was inspired by Richard Morris Hunt's design for the William K. Vanderbilt House in New York City; at the time, the French Renaissance Revival style had not spread to Illinois, which made Bell's work distinctive in the region. The building's design features a limestone exterior, arched entrances and first-floor windows, and an ornate roof with pointed gables and dormers.The building, also known as the Orville H. Browning Station, was listed on the National Register of Historic Places on December 2, 1977.

The Villa Kathrine is a Moroccan-style home located on the bluffs overlooking the Mississippi River in Quincy, Illinois. This home is the subject of a local lost treasure story as well as a ghostlore story featuring a dog.

B’nai Sholom Temple is a synagogue in Quincy, Illinois. It was built in 1870 in the Moorish Revival style. The original, 80 foot high, twin minaret-style towers were damaged by a tornado in 1947 and not replaced.The B’nai Sholom Congregation in Quincy dates from 1852.