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Indiana, county, west-central Pennsylvania, U.S., bounded to the south by the Conemaugh River. It consists of a hilly region on the Allegheny Plateau that rises to the Allegheny Mountains in the southeast and is drained by Crooked, Yellow, Two Lick, Blacklick, and Little Mahoning creeks. Other waterways include Yellow Creek Lake, which is surrounded by Yellow Creek State Park. Indiana county was created in 1803 and named for Indiana Territory (now the state of Indiana)....