Buffalo's County is Erie, a four letter word. Erie is located in the U.S. state of Pennsylvania and is the most populous county in the state. It is named after the Erie tribe of Native Americans who lived along the southern shore of Lake Erie before European settlement. The county seat is Erie, the state's fourth-largest city. Erie County is home to many attractions, including Presque Isle State Park, Waldameer Park & Water World, and the Erie Zoo.