There are 21 US Post Offices in Columbiana County serving a total of 133,874 residents equating to 6,375 residents per post office. It's estimated that approximately 213,678 packages are handled across the 21 county post offices annually. Columbiana County is a county located in the U.S. state of Ohio. As of the 2010 census, the population was 107,841. The county seat is Lisbon. The county name is derived from the explorer of the Americas, Christopher Columbus. Columbiana County comprises the Salem, Ohio Micropolitan Statistical Area, which is also included in the Youngstown\u2013Warren, OH-PA Combined Statistical Area. It also abuts the Pittsburgh area directly to the east and south. Pittsburgh International Airport is only a 35-minute drive southeast of East Liverpool, while Downtown Pittsburgh is only 50 minutes away. Due to its location, Columbiana County is traditionally considered part of both Appalachian Ohio and the Steel Valley, sharing more in common culturally with neighboring Western Pennsylvania and West Virginia (both of which are also part of Appalachia) than much of Northeast Ohio in general. Officially considered part of the Youngstown television market, the Steubenville television market regularly reports in the area as well.