Oswego County Courthouse is a historic courthouse located at Oswego in Oswego County, New York. It was built in 1859-1860 and altered in 1891 and again in 1962. The two story building rises above a cruciform plan and is constructed of load bearing masonry walls faced with smooth ashlar limestone. It features a portico surmounted by a domed cupola. It was designed by noted architect Horatio Nelson White (1814รข€"1892).
It was listed on the National Register of Historic Places in 2000.
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