Confused exactly which counties make up the Twin Tiers of New York and Pennsylvania? It would seem you're not the only one so there's no need to feel bad.

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While researching for an article about a county in Pennsylvania that has seen a decent population increase, we wanted to make sure that we worded things correctly so we turned to a friend who was born and raised in the county we were writing about to find out which category he thought it would fall under, giving him the options of "Southern Tier" or "Twin Tiers."

His pick? Neither. Instead, he said that Bradford County would fall under the name of "Northeast Pennsylvania." We went with his suggestion in our article but it still nagged at us that Bradford county must surely fall under the Twin Tiers category and so we decided to do some digging to find out who was correct.

The Twin Tiers are made up of the counties that sit on the New York/Pennsylvania border. Easy enough right? Maybe not. There are two different halves of the Twin Tiers and they are known as the Southern Region which are the counties located in New York and the Northern region which are the counties located in Pennsylvania.

Which Counties Are in the Northern Tier of the Twin Tiers?

Bradford, Sullivan, Tioga, Susquehanna, Wyoming, McKean, and Potter Counties make up the northern portion of the Twin Tiers.

Only offering more confusion is the fact that of the counties in the Northern Tier of the Twin Tiers McKean, Potter, and sometimes Cameron Counties like to be lumped in under the Twin Tiers name but they do not consider themselves part of the Northern Tier. Super confusing, right?

Which Counties Are in the Southern Tier of the Twin Tiers?

Delaware, Broome, Tioga, Chemung, Steuben, Allegany, and Cattaraugus Counties make up the southern portion of the Twin Tiers.

Interestingly, although the Twin Tiers is said to be the name of the counties that sit on the New York/Pennsylvania border, Erie and Warren Counties in Pennsylvania are generally not considered to be part of the Twin Tiers even though they clearly sit on the borders. But wait, there's more. Every once in a while Warren County is lumped into the grouping of the Twin Tiers, but sometimes it isn't and we aren't exactly sure why.

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