Twin Tiers

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This map indicates the area known as the Twin Tiers. Counties in DARK GREEN are almost always considered part of the Southern Tier. Counties in DARK RED indicate the Northern Tier. Counties in BLUE are those in Pennsylvania that use the name "Northern Pennsylvania," and counties in LIGHT GREEN are those that sometimes consider themselves Southern Tier Counties. The LIGHT BLUE areas are associated with the Twin Tiers but are not part of the region proper.

The Twin Tiers is a geographical term that refers to the collective counties that lie on the New York-Pennsylvania border adjacent to the 42nd parallel north.

Separately, the two halves of the Twin Tiers region are known as the Southern Tier region in the state of New York and the Northern Tier region in the Commonwealth of Pennsylvania. Somewhat counterintuitively, the Southern Tier is in fact further north than the Northern Tier, and conversely the Northern Tier is south of the Southern Tier. This is because the "Northern" and "Southern" designations are relative to the states in which they are located, not relative to each other.

The region is predominantly rural and contains many small towns. It is usually defined as including the following counties:

Northern Tier Southern Tier

In an oddity, McKean, Potter and (less often) Cameron Counties refer to themselves as part of the Twin Tiers but almost never consider themselves part of the Northern Tier, instead going by the name "Northern Pennsylvania." There is often significant "bleedover" in regions: for instance, the western part of the region (McKean and Potter Counties) often will associate themselves with St. Marys, a city larger than any city in that area but in Elk County, just south of what is considered "Northern Tier" by any standard.




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