Twin Tiers
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Image:Map of New York highlighting Southern Tier.png
The Southern Tier region of New York
Image:Map of PA Northern Tier.gif
The Northern Tier region of Pennsylvania
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.
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.
Erie County, Pennsylvania and Warren County, Pennsylvania are almost never considered part of the Twin Tiers.
