Southern Tier

This article is about the region of New York. For the region of the United States that is sometimes referred to by this term, see Deep South.

Southern Tier of New York
Region
Skyline of Binghamton, New York
Core Southern Tier counties   Peripheral counties
Country	United States
State	New York
Region	Upstate New York
Counties	Allegany, Broome, Cattaraugus, Chautauqua, Chemung, Chenango, Cortland, Delaware, Otsego, Schoharie, Schuyler, Steuben, Tioga, Tompkins
Major cities	Binghamton, Corning, Elmira, Hornell, Ithaca, Jamestown, Olean, Owego
Population  (2024)
• Total	1,013,290
Time zone	UTC-5 (EST)
• Summer (DST)	UTC-4 (Eastern Daylight Time)
Area codes	607, 585, 716

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The Southern Tier is a geographic subregion of the broader upstate region of New York State, geographically situated along or very near the state border with Pennsylvania. Definitions of the region vary widely, but generally encompass counties surrounding the Binghamton, Elmira-Corning, and Jamestown metropolitan areas, along with the land of the Seneca Nation. This region is adjacent to the Northern Tier of Pennsylvania, and both these regions together are known as the Twin Tiers.

Geographically, most of the Southern Tier resides in the Allegheny Plateau of the Appalachian Mountains, with the eastern areas of the region nestled in the western portion of the Catskill Mountains. A longtime home of the Iroquois Confederacy, European settlers moved to the region after the American Revolutionary War. The fertile yet hilly land, combined with sweeping river valleys, led the region to support a combination of manufacturing industries (including large companies such as IBM and Corning Inc.) and farming, but with less development compared to neighboring subregions of upstate. Since the 1950s, the area is often considered to be a part of the Rust Belt, as manufacturing jobs have left the region.