Charles C. Platt Homestead

The William Bailey House is a historic house located at 176 Cornelia Street in Plattsburgh, Clinton County, New York.

Z. Ritchie House is a historic home located at Plattsburgh in Clinton County, New York. It was built between 1856 and 1869 and is a two-story, frame dwelling on a stone foundation in the Gothic Revival style. It features a cross-gable roof, decorative bargeboards, and a one-story projecting bay with ornate balustrade.It was listed on the National Register of Historic Places in 1982.

D'Youville Academy is a historic school building and nunnery in Plattsburgh in Clinton County, New York. It was built about 1878 and is a 2+1⁄2-story, cruciform plan brick structure on a raised stone foundation. The facade features a rounded 2-story bay, a five-gable roof dormer, and Mansard roof. The Academy was founded about 1878 and operated by the Grey Nuns, founded by Saint Marie-Marguerite d'Youville (1701-1771). The Academy has since been folded into the Seton Catholic Central High School, and the building has since been converted into apartments. It was listed on the National Register of Historic Places in 1982.

Kent-Delord House, also known as Kent-Delord House Museum, is a historic home located at Plattsburgh in Clinton County, New York. It was built in 1797 and is reputedly the oldest house in Plattsburgh. It is a two-story, rectangular plan, wood frame dwelling with a gable roof. It features a one-story, pedimented entrance porch and inside end brick chimneys. It is open as a local history museum. It was listed on the National Register of Historic Places in 1971.

Court Street Historic District is a national historic district located at Plattsburgh in Clinton County, New York. The residential district includes 51 contributing buildings. The district generally consists of large scale Queen Anne or Colonial Revival style residences built in the early 20th century, with some examples of mid-19th century Greek Revival and Italianate style residences.It was added to the National Register of Historic Places in 1982.

S. F. Vilas Home for Aged & Infirmed Ladies is a historic multiple dwelling located at Plattsburgh in Clinton County, New York. It was built in 1889-1890 and is a three-story, brick, monumental multiple dwelling structure in the Queen Anne style. It features truncated hipped roofs with cross-gable wings, corbelled decorative chimneys, and bands of colored brickwork. It was built as a 44-bed residence for aged and infirmed women.It was listed on the National Register of Historic Places in 1982.

The Clinton County Courthouse Complex is a historic county government and courthouse site located at 135 Margaret Street in Plattsburgh, Clinton County, New York. The main courthouse was constructed in 1889. It is a two-story, ashlar stone and brick Richardsonian Romanesque style building. It has a hipped roof and rock-faced arched openings. It features a large, square central tower with an open campanile and pyramidal roof. The associated Surrogate's Building was built in 1884–1885, and is a two-story, Italianate style brick building with a bracketed cornice with Renaissance style detail.The courthouse complex was added to the National Register of Historic Places on November 12, 1982.

Brinkerhoff Street Historic District is a national historic district located at Plattsburgh in Clinton County, New York. The residential district includes 13 contributing buildings. The district generally consists of one and one half / two story brick or frame residences built between 1845 and 1890.It was added to the National Register of Historic Places in 1982.

W. W. Hartwell House & Dependencies, also known as Regina Maria Retreat House, is a historic home located at Plattsburgh in Clinton County, New York. It was built about 1870 and is an elaborate stone mansion featuring a three-story tower with a Mansard roof in the Second Empire style. The house is set among park-like landscaping. Also on the property are a cottage and a stone carriage house.It was listed on the National Register of Historic Places in 1982.

Paul Marshall House is a historic home located at Plattsburgh in Clinton County, New York. It was built about 1828 and is a 2+1⁄2-story, stone-and-brick structure on a stone foundation in the Federal style. It features a dressed stone facade and corbelled stone chimneys.It was listed on the National Register of Historic Places in 1982.

House at 56 Cornelia Street is a historic home located at Plattsburgh in Clinton County, New York. It was built in about 1850 and is a two-story, rectangular building on a stone foundation. It features a porch with a moulded cornice and decorative brackets.It was listed on the National Register of Historic Places in 1982.

Plattsburgh City Hall is an historic government building located at City Hall Place in Plattsburgh, Clinton County, New York. It was designed by architect John Russell Pope and constructed in 1917. It is a three-story, steel frame, limestone clad building in the Classical Revival style. It features a projecting entrance portico with six Doric order columns and a low central dome.: 6–7  It was added to the National Register of Historic Places on December 12, 1973.