New York State Route 840 (NY 840) is an east–west state highway in Oneida County, New York, in the United States. It is a 4.02-mile (6.47 km) superhighway extension of Judd Road (County Route 840 or CR 840), which ends at Halsey Road (County Route 52 or CR 52) in Whitestown. The western terminus of NY 840 is at the junction of Judd and Halsey roads while its eastern terminus is at an interchange with the North–South Arterial (NY 5, NY 8, and NY 12) near the southern city line of Utica. NY 840 opened to traffic in 2005, and the road was ceremoniously designated as the Officer Joseph D. Corr Memorial Highway in 2007. In 2008, part of Judd Road was redesignated as CR 840 to match the designation of its state highway continuation.